Misc: Who invented the predecessor to today's computers?

Questions

It's been estimated that an opera singer burns an average of more than ---- calories per minute during a performance.?

Left-handed people are ----- percent more likely to sample a forkful of food from the plates of fellow diners than are right-handed people.?

Chocolate manufacturers use 40 percent of the world's ----------?

Each year, approximately 250,000 American husbands are physically attacked and beaten by -----------------?

Each year, more than 300,000 American teenagers become afflicted with some form of ---------------?