Learn

Divisibility Tests
A number is divisible by:

2: if the last digit is 0, 2, 4, 6 or 8.
3: if the sum of the digits is divisible by 3.
4: if the number formed by the last two digits is divisible by 4.
5: if the last digit is either 0 or 5.
6: if it is divisible by 2 AND it is divisible by 3.
8: if the number formed by the last three digits is divisible by 8.
9: if the sum of the digits is divisible by 9
10: if the last digit is 0.

How do we smell?
Basically, all the stuff which we can smell release a large set of molecules called 'odorants'. These odorants can be specifically recognised by sensory neurons in the nose. Each odour triggers a specific set of neurons and transmits that signal to the brain. An average human brain can distinguish between one trillion different odorants.

New cells are formed constantly in our bodies, whether it is to take the place of old cells which die out, or for growth or repair of damage. But what happens when unnecessary new cells are formed in our bodies? These new cells are termed as tumor. And when this tumor grows larger & starts to negatively affect our bodies, then they are said to be malignant or 'cancerous'.

There Their They're.

"Eye crusties", which you find near the opening of your eyes when you wake up, are actually called 'Meibum'. Secreted by meibomian glands, they help to keep the eyes airtight during sleep to prevent flow/evaporation of tears.

Head Rush, which is medically termed as Orthostatic Hypotension, happens to some people while suddenly standing up after long periods of lying down. It happens because the sudden change in orientation causes the blood to pool in the lower body, resulting in less blood being pumped by the heart (sudden decrease in blood pressure).