It is known that all vertebrate animals yawn. The cause of yawning is not fully understood, but it is surely contagious. Ostriches are known to yawn as soon as they are hatched. Yawning happens mostly before sleep. At night, when ostriches are ready to settle down, they yawn in groups. First, the leader yawns, followed…
Tea bricks are made by compressing tea leaves of the black tea, ground tea or fermented variety. Because of its high value, tea bricks were used as currency in the late 19th and the 20th century in China and Tibet. Special tea bricks were made with ground tea leaves that were bound with flour or…
Stefan Edberg, the former world no. 1 tennis player, was born on the same day as Indira Gandhi became India’s Prime Minister, i.e. January 19, 1966. On January 19, 1966, the congress voted for its Prime Minister and Indira Gandhi received 355 votes, making her victorious. She held the office of prime minister with effect from…
Kronecker’s delta is defined as 0, if i ≠ j δij = 1, if i = j For example, δ12 = 0, whereas δ33 = 1. Kronecker’s delta is a function between two variables, which are integers. The function is 1 if the two variables are the same or equal, and the function is zero…
The two famous presidents of the United States of America Abraham Lincoln and John F. Kennedy shared strange coincidences. Abraham Lincoln was elected to Congress in 1846. John F. Kennedy was elected to Congress in 1946. Abraham Lincoln was elected President in 1860. John F. Kennedy was elected President in 1960. The names Lincoln and Kennedy, each…
Venus is only 40 million kilometres closer to the sun than we are. Its size is very much like the earth. But this small distance of 40 million kilometres has made all the difference. Venus and Earth are often called twins because of their similar size, mass, density, composition and gravity. However, Venus is the hottest…
