Who formulated the law of universal gravitation?
AnswerIsaac Newton
Newton published it in 1687 in the Principia.
Science · Facts & stats
Universal facts & stats
7 fact-checked facts about universal laws, constants and standards, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Which letter is the symbol for the speed of light?
Answerc
c comes from the Latin celeritas, meaning speed.
Going deeper
The UN adopted the Universal Declaration of Human Rights in which year?
Answer1948
It was adopted on December 10, 1948.
What does UTC stand for?
AnswerCoordinated Universal Time
UTC is the world's reference time standard.
Which blood type is known as the universal donor for red blood cells?
AnswerO negative
O negative red cells lack A, B and Rh antigens.
Expert level
Who created Esperanto as a universal second language?
AnswerL. L. Zamenhof
Zamenhof published the first Esperanto book in 1887.
Avogadro's constant is approximately what?
Answer6.022 × 10^23 per mole
It is the number of particles in one mole of a substance.
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