The Law of Gravity was discovered by:

X-Rays were discovered by:

Vaccination was discovered by

Oxygen gas was discovered by

The theorem "In a right angle triangle the area of the square of hypotenuse is equal to the sum of the areas of the squares of the other two sides", was discovered by:

The young Blue Hole (YBH) which was discovered in South China Sea has the depth of ___in?

Penicillin was discovered by:

Insulin was discovered by:

Antibiotic "Penicillin" was discovered in:

Who discovered circulation of blood in the human body?