Change the sentences according to directions :

Aren't very few scientists as famous as Newton?/Are many scientists as famous as Newton?

He observed an apple which was falling from a tree.

Didn't he become curious about the reason behind it?

After researching the event, he formulated the law of gravity./By researching the event, he formulated the law of gravity.

Newton spent many years while he was studying nature's mysteries.

Everybody must acknowledge/admit Newton's contribution to science.

He faced many challenges, but he continued his research.

He believed that it was a natural force.

He explained gravity scientifically and he was the first one to do so.

How amazed Newton was by nature's wonders!