Misc: In 590 St ---------- begins his reign as Catholic Pope. ?

Questions

In computing which letter of the alphabet represents 1,024 bytes?

Who is the only female tennis player to win the grand Slam and an Olympic gold medal in the same year?

The Stone of Scone is a relic sacred to which country?

Which English river has the same name as a Russian one?

Geronimo was the leader of which North American people?