What is the importance of February 28 for India?

🇮🇳🗓 Since 1986, every year in India, National Science Day is observed on February 28.

This date is related to the time period in 1928 when Indian Physicist Chandrasekhara Venkata Raman (1888-1970) ⬆️ announced discovery of the Raman Effect, or the Raman scattering.

The Raman Effect is the phenomenon where light gets scattered when passed through a transparent material, leading to changes in wavelength and energy.

CV Raman also received the Nobel Prize in Physics in 1930 due to his significant contribution in this field of science.

The day aims to raise awareness about the importance of scientific applications in our daily lives.

The day also aims to celebrate and acknowledge the efforts and achievements of scientists in human welfare.

The theme for National Science Day 2024 is - Indigenous Technologies for Viksit Bharat.

💬✍️"Success can come to you by courageous devotion to the task lying in front of you." - CV Raman

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What are some surprising facts about leap years?

ℹ️ 2024 is a leap year with an extra day on February 29.

✍️ Here are some interesting facts about leap years and February 29 ⬇️.

📍🗓 In his Julian calendar, Julius Caesar introduced the first leap year around 46 B.C., but this calendar had only one rule: Any year evenly divisible by four would be a leap year. That created too many leap years, but the math wasn't tweaked until Pope Gregory XIII introduced his Gregorian calendar more than 1,500 years later.

📍 All the other months in the Julian calendar have 30 or 31 days, but February lost out to the ego of Roman Emperor Caesar Augustus. Under his predecessor Julius Caesar, February had 30 days and the month named after him - July - had 31. August had only 29 days. When Caesar Augustus became Emperor he added two days to 'his' month to make August the same as July. So February lost out to August in the battle of the extra days.

📍 Without an extra day on February 29 nearly every four years, we would lose almost six hours every year. After only 100 years, our calendar would be off by approximately 24 days.

📍 People born on February 29 are called "leaplings" or "leapers".

📍 The odds of being born on a leap day are 1 in about 1500.

📍🔮 Astrologers believe people born on February 29 have unusual talents

📍🇮🇹🇬🇷🇷🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿 Some countries, e.g. Italy, Greece, Russia and Scotland, consider Leap Year and Leap Day to be the unluckiest of times.

📍💍 In some countries, it's OK for a woman to propose to a man on February 29.

📍🐸 In some countries, the frog is a symbol associated with February 29.

📍🇺🇸 The twin cities of Anthony, Texas, and Anthony, New Mexico, are the self-proclaimed Leap Year Capital of the World. They hold a four-day leap year festival that includes a huge birthday party for all leap year babies. (ID required.)

📍🇫🇷 🗞 Since 1980, a special French newspaper has only been published on Leap Day. La Bougie du Sapeur is only available on February 29, and it usually outsells all other newspapers on that day.

📍🎂 Many companies don’t recognize Leap Day as a “valid day.” They make leapers choose Feb. 28 or March 1 as their birthday instead.

📍🫰💳 Most employees who are paid fixed monthly incomes will work for free on Feb. 29 because their wages are likely not calculated to include the extra day.

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How many early human species existed on Earth?

The answer to this question depends on the definition of a human, the definition of a species and the degree to which you accept variation within a species.

Most experts agree that our species, Homo sapiens (Latin for “wise men”), may be the ninth and youngest human species.

H. habilis: the handyman (2.4 million – 1.4 million years ago)

H. erectus: the enduring hiker (1.89 million to 110.000 years ago)

H. rudolfensis: the stranger (1.9 million to 1.8 million years ago)

H. heidelbergensis: the hunter (700,000 to 200,000 years ago)

H. floresiensis: the Hobbit (100,000 to 50,000 years ago)

H. neanderthalensis: The Neanderthal (400,000 – 40,000 years ago)

H. naledi (335,000 to 236,000 years ago)

H. luzonensis (at least 67,000 years ago)

Some scientists say that there were up to twenty early human species.

There is also a growing debate about whether H. Sapiens, Neanderthals and Denisovans are in fact all one species.

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Who was the only member of genus Homo during nearly a million years?

According to scientists, Homo habilis lived as the only member of genus Homo for nearly a million years.

This species with a slightly larger braincase and smaller face and teeth than older hominin species is widely considered to be the first member of the genus Homo that evolved from apes. But it still retained some ape-like features, including long arms and a moderately-prognathic face.

Its name, which means ‘handy man’, was given in 1964 because this species was thought to represent the first maker of stone tools. Currently, the oldest stone tools are dated slightly older than the oldest evidence of the genus Homo.

Researchers believe that Homo habilis lived in Eastern and Southern Africa between 2,4 and 1,4 million years ago, its average height was 100-135 cm (3 ft 4 in – 4 ft 5 in) and its average weight was 32 kg (70 lbs).

Look at one of facial reconstructions of Homo habilis ⬆️.

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What Homo species was the first that stood fully upright and cooked its food?

As the name implies, Homo erectus (also called Homo ergaster) is the first known Homo species that stood fully upright.

Homo erectus featured other, modern human proportions distinct from those of apes: shorter arms relative to the torso, and long legs adapted for walking and running, rather than climbing trees.

Scientists found campfires and hearths near the remains of Homo erectus, suggesting they were also the first humans to dabble with cooking — a uniquely human activity that gave access to easily digestible food, allowing brains and bodies to grow.

Researchers believe that Homo erectus was a very successful species that lived in Africa and in Asia between 1,89 million and 110,000 years ago, its average height was 145-185 cm (4 ft 9 in – 6 ft 1 in) and its average weight was 40-68 kg (88-150 lbs).

Look at one of facial reconstructions of Homo Erectus ⬆️.

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What humans were the first to live in cold places?

Homo Heidelbergenis (sometimes referred to as Homo Rhodesiensis) was the first early human species to live in colder climates.Their short, wide bodies were likely an adaptation to conserving heat.

It lived at the time of the oldest definite control of fire and use of wooden spears, and it was the first early human species to routinely hunt large animals and to build shelters out of wood and rock.

Researchers believe that Homo Heidelbergensis lived in Africa, in Europe and possibly in Asia between 700,000 and 200,000 years ago. The average height for males and females was 175 cm (5 ft 9 in) and 157 cm (5 ft 2 in) respectively. The average weight for males and females was 62 kg (136 lbs) and 51 kg (112 lbs) respectively.

Heidelbergensis is the latinised word for 'Heidelberg', the German city where the first fossil of this species was discovered in 1907-08.

Look at one of facial reconstructions of Homo Heidelbergensis ⬆️.

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What could play a unique role for the emergence of life on Earth?

🌋⚡️A new study says that lightning strikes hitting volcanic eruptions ⬆️ could play a crucial role in producing high levels of nitrogen, thereby facilitating the birth of the earliest life forms.

Nitrogen, a fundamental element for life on Earth, when combined with lightning, reacts with oxygen to form nitrogen oxide, which then gets released into the soil, creating a fertile ground for life to emerge and thrive.

The researchers analyzed samples from ancient volcanic sites and found that the substantial amounts of nitrates found were of atmospheric origin, suggesting that these essential life-giving elements were delivered by lightning, not derived from the volcanic eruptions themselves.

The phenomenon of volcanic lightning, which typically occurs at the eruption’s onset, was observed in two key areas: near the ground within ash clouds and higher up in the plume of volcanic smoke that reaches the stratosphere.

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What are the different parts of a plant?

🌱🍀🌿 Broadly, plants have 2️⃣ organ systems:

🟤 The Root System that covers the underground parts of a plant and includes the roots, tubers, and rhizomes.

🟢 The Shoot System that consists of parts found above the ground, such as leaves, stems, flowers, and fruits.

A typical diagram of a plant body consists of 3️⃣ parts:

🟫 Roots, that lie below the surface of the soil. The top part of a root (root apex) is covered by a covering known as root cap.

🟩 Stems, found above the ground and are structurally divided into nodes, the regions where leaves are found, and internodes, the areas in-between the nodes.

🍃 Leaves, each having specialized functions and mostly found above the ground and attached to the stem.

A flowering plant also contains:
🌷🌼🌺 Flowers, the most colorful and attractive parts of a plant,
and
🍓🫑🍅 Fruits, the ripened ovary found in flower after fertilization.

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What are the functions of each part of a plant?

Here are the key functions of each part of a plant.

🟤 Roots
☑️ Absorbing water and minerals from the soil
☑️ Storing food for future use
☑️ Producing plant growth hormones
☑️ Anchoring the plant firmly to the soil and providing support
☑️ Developing new plants from the roots of the old plant (vegetative reproduction)

🟢 Stems
✔️ Providing strength and support to buds, flowers, leaves, and fruits
✔️ Storing food mainly in the form of starch
✔️ Transporting food, water, and minerals to all parts of the plant body
✔️ Developing new plants from the stem of the old plant (vegetative reproduction)

🍃 Leaves
✅ Making food for the plant with the help of sunlight, carbon dioxide, and water through photosynthesis
✅ Helping in reproduction such as in Bryophyllum, a group of sprout leaf plants
✅ Helping in evaporation from the aerial parts of the plant by transpiration
Apart from these main functions, leaves of some plants are modified to form tendrils, that help in climbing (e.g., pea plant) or spines, helping in protection (e.g., cactus). Some leaves may turn fleshy to store food (e.g., onion plant).

🌺 Flowers
🔺 Helping in the sexual reproduction of plants
🔺 Stimulating pollination in plants and fertilization of the ovule
ℹ️🌸 A flower contains 4️⃣ main parts:
a) Sepals: Green parts of a flower found below the petals that protect flower buds from injury.
b) Petals: Colorful parts of a flower found above the sepals that help in pollination.
c) Stamens: Consists of an anther and a filament. They are the male reproductive part of a plant producing male sex cells or spermatia.
d) Carpel: Consists of stigma, style, and ovary. They are the female reproductive part of a plant producing female sex cells or ovules.

🥔🍓🥦 Fruits
🔸 Protecting the growing seeds
🔸 Helping in the dispersal of seeds and thus in plant reproduction

❗️ Thus although each part of a plant has its specific functions, they all work in combination to provide distinct advantages in plant growth and survival.

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Why do plants have different leaves?

🍃 Everything about a leaf — from the size, the thickness, the smoothness to its vein structure and segmentation — is part of its function. Each of these characteristics is an adaptation or optimization that helps leaves fulfill its main purpose, which is photosynthesis, as well as absorb sunlight, distribute water, regulate heat loss, avoid pests, etc.

🍀 Scientists say that the two major factors that influence leaf shape are evolutionary history and environment.

🌱 Plants from the same species can have very different-looking leaves in different climates.

🌿🌐 Researchers have found correlations such as latitude and shape (closer to the equator=simpler leaves), temperature and teeth (colder climate=more teeth), and moisture and size (wetter environment=larger leaves).

☘️🧬 Scientists have also identified a genetic mechanism responsible for leaf diversity that may offer new tools to help plants withstand different climate conditions.

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How does a desert plant pull moisture from the air?

🔸 When it comes to eking out a living without much water, some desert plants can grow deep-reaching roots to get a drink from far underground.

🔸 But one dry-adapted plant turns to another source to gain moisture: the air.

🔸 Spindly shrubs called athel tamarisks (Tamarix aphylla) draw salty water from the soil and excrete the salt from their leaves ⬆️. Then, at night, these crystals allow them to collect water from the air.

🔸 Researchers found that this salt contained at least ten different materials, which together allowed it to pull water from the air at low humidities. One of these components was lithium sulfate, which could gather water at the lowest humidities.

🔸 These natural salts are likely to be environmentally safe, and identifying them could help engineers improve practices for pulling moisture from the air in water-strapped regions.

ℹ️ This finding is considered one of the most promising discoveries in 2023.

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What is the leading explanation for how the universe began?

💥The Big Bang Theory is the leading explanation for how the universe began.

💥It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching.

💥This idea belongs to a Belgian astronomer Georges Lemaître (1894-1966).

💥⚛️🌠☄️This theory says that at the very beginning the universe was just hot, tiny particles mixed with light and energy. As everything expanded and took up more space, it cooled down. The tiny particles formed atoms, which over lots of time came together to form stars and galaxies. The first stars created bigger atoms and groups of atoms. That led to more stars being born. At the same time, galaxies were crashing and grouping together. As new stars were being born and dying, then things like asteroids, comets, planets, and black holes formed.

💥According to the theory, the universe could be 13.8 billion years old.

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