Who invented seismograph for detection of earthquake and measurement of its intensity?

When was computer giant Microsoft Corporation established?

Which was the most damaging earthquake in recent history?

When and where were playing cards invented?

When was the ship’s distress signal SOS/Save Our Souls used first?

Who invented the first personal computer?

What is pig iron? How did this name get derived?

How was the circulation of the blood proved?

When were elephants first used in war and how far were they effective?