Questions

Footsteps. 

Yes, as you walk forward, you will leave the footstep behind you.

The reactivity of an atom arises from the existence of unpaired electrons in the valence shell.

The land breeze is a coastal breeze at night blowing from the land to the ocean. It is caused by the difference in the rates of cooling of the land and of the ocean. Once again, the bigger the difference in temperature between the two, the stronger the wind.

Microsoft has acquired Flipgrid, an education start-up with an app that lets students record and share videos on specific topics with their classmates.

Microsoft is making Flipgrid free of charge.

Muḥammad ibn Mūsā al-Khwārizmī, formerly Latinized as Algorithmi,was a Persianscholar who produced works in mathematics, astronomy, and geography under the patronage of the Caliph Al-Ma'mun of the Abbasid Caliphate.

He also developed the concept of the algorithm in mathematics, which is why some have called him the "grandfather of computer science".

His name gave rise to the terms algorism and algorithm.

Every ecosystem must have Autotrophs.

According to Guiness World Records, the world's oldest living man Masazo Nonaka has turned 113 years on 25 July of 2018 in Japan's Hokkaido.

Francisco Nunez Olivera was the former oldest person who died on 29th of January 2018 at the age of 112 years.

Les Colley (1898 - 1998, Australia), is the oldest ever man to father a child. He had his ninth child a son named Oswald to his third wife at the age of 92 years 10 months.