Misc: What is the binary equivalent of decimal 10?

Questions

Which Mediterranean island has coasts on three seas - Mediterranean, Ionian, and Tyrrhenian?

Israel Tongue and who else devised the "Popish Plot"?

Which element has the chemical symbol Cs; capital C lower-case s?

In 1950, which mountain was the first of over 26,000 feet to be climbed to the summit?

Which photographer, in 1976, told us that we'd take great snaps if we used an Olympus?