useless trivia: What Word Means: A Marine Fish - Plural Of Mola, A Colorful Blouse?

Questions

Which crab, having no hard shell of its own, protects itself by taking over the shells of dead molluscs?

Which chemical element takes its name from the greek word for colour?

In the constellation Gemini, who are the twins?

How many bits, handled as one unit, constitute a byte?

What is psephology?