Why does ice float?

It all comes down to density. Water is densest at 4° celsius. Ice is less dense than when water is in liquid form. This is because water molecules inside ice have a lot of empty spaces between them. Therefore, in order for something to sink all the way to the bottom of water, it should have more density than water. This explains why ice doesn’t sink.

Read More

Why do astronauts float in ISS?

The first reason that we might think is because of zero gravity in the ISS orbit. This is not true. Gravity still exists at the height from above Earth where ISS is orbiting. However, astronauts float in ISS because of something called free-falling.

Read More

Why are plants green?

Sunlight visible by human eye is made up of rainbow colors namely VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red).

A color that an object, or a living thing (such as plants) appears to have is the wavelength that it reflects after absorbing the remaining wavelengths In this case, plants reflects green wavelength and absorbs the remaining wavelengths of light. Therefore, plants appear to be green.

What are leap seconds?

Do you know that occasionally at around 23:59:59 UTC, the minute is going to have an extra second, i.e, a total of 61 seconds? Yes you heard it right. There are overall 27 such seconds inserted in the past. When the correction is made, it usually happens at the end of June or December or sometimes both.

Read More

Googolplex

Do you know that Google derived its name from a number called googol? The number googol is equivalent to 10^100 which is equal to number 1 followed by 100 zeros.

Read More