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?

Human Biology

Which is the heaviest organ in human body?

Human Biology

Why do our faces keep warm without clothes?

Science and Technology

What is bionic technology or bionics?

How things work

Whose idea was it to produce electricity from nuclear energy?

World

When was computer giant Microsoft Corporation established?

Living Creatures

How do honeybees help plants?

Outer Space

What is antimatter? Are there stars and planets made of antimatter?