World

When was the ship's distress signal SOS/Save Our Souls used for the first time?

Outer Space

Is there a supermassive black hole at the center of our Milky Way galaxy?

Human Biology

Why can't we see in the dark like cats and owls?

How things work

If one walks inside a train in the same direction the train is moving, does one move faster than the train?

Science and Technology

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

World

Who Invented The World Wide Web? When Was It?

Living Creatures

Can insects like fly hear?

World

What was the first logo of the camera brand Canon? Why did it fail?

World

How old were the early mechanical clocks?

How things work

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

Human Biology

How was blood circulation proved by William Harvey?

World

What is the D-day and what does it mean?

Planet Earth

How many oceans are there on the Earth?

Science and Technology

Who invented the first personal computer, and when?

World

Which was the most damaging earthquake in recent history?