All questions asked by Den Allan

List all solved & unsolved questions asked by Den Allan

"She gave him the thumbs-up sign." and "She gave him a thumbs-up sign." What is the difference?

1 English Language Learners Asked on 10/01/2021

When and how was it discovered that the sun was in different positions depending upon longitude?

1 History of Science and Mathematics Asked on 09/02/2021

archaeoastronomy navigation time

When was the earliest usage of diagrams to represent set relations?

0 History of Science and Mathematics Asked on 09/02/2021

biographical details mathematics philosophy of science

Has any large group of people used a base other than 10, 20 and 60 for ordinary purposes?

1 History of Science and Mathematics Asked on 09/02/2021

mathematics notation number theory

How well was alcoholism understood at a time when people drank chronically?

0 History of Science and Mathematics Asked on 09/02/2021

What was the first "scientific", non-photographic depiction of Earth as seen from outside of Earth?

1 History of Science and Mathematics Asked on 09/02/2021

16th century 17th century 18th century 19th century discoveries

Was Herschel ever inspired to write music through his astronomy research?

1 History of Science and Mathematics Asked on 09/02/2021

What did the Soviets do with German scientists after WWII?

4 History of Science and Mathematics Asked on 09/02/2021

cold war nazi germany scientists soviet union

When did the people start using the portraits of the two Euclids interchangeably?

2 History of Science and Mathematics Asked on 09/02/2021

debunking depiction of scientists euclid mathematicians

Who really was the first inventor of the laser?

1 History of Science and Mathematics Asked on 09/02/2021

discoveries photonics physicists physics

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