Our Vedic scholar Sayana, from 14th century has already explained about the speed of light. He said "With deep respect, I bow to the sun, who travels 2,202 yojanas in half a nimesha".
Hunuman Chalisa calculated the distance between the sun and earth. Hanuman travelled 1 Yuga = 12000 years so 1 Sahsra Yuga = 12000000 years add 1 Yojan = 8 miles. Hence, “Yug Sahsra Yojana” means 153,600,000 kilometers.
Mahabharat mentioned the concept of Cloning and Test Tube Babies. Each ‘Kaurava’ was created by splitting the single embryo into 100 parts and growing each part in a separate kund. This is identical to the cloning process today.