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Dmitry Grigoryev
  • Member for 7 years
  • Last seen this week
  • Strasbourg, France
125 votes

Why can I touch aluminum foil in the oven and not get burned?

58 votes

If water is incompressible, how can sound propagate underwater?

42 votes

If visible light has more energy than microwaves, why isn't visible light dangerous?

26 votes

Why doesn't a mercury thermometer follow the rules of volume dilatation?

24 votes

Will helium in the tires of a bike make it lighter?

18 votes

Why bother buying efficient lights if you are already heating your house?

17 votes

Why is it so inefficient to generate electricity by absorbing heat?

16 votes

What is the function of this complicated tensioning system?

16 votes

Why aren't rainbows blurred-out into nothing after they are produced?

15 votes

How does this baby rattle work?

15 votes

Is weight a scalar or a vector?

13 votes
Accepted

Highly nonlinear equations

11 votes

Why is my hand not burned by the air in an oven at 200 °C?

8 votes

How does the speed of electricity become the same as the speed of light?

7 votes

Why does glass, in spite of being amorphous, often break along very smooth surfaces?

7 votes

Easy to perform quantitative experiments at home

7 votes

How much additional mass does the Earth gain each day from solar radiation?

7 votes

Could dark matter consist of the supermassive black holes at the centers of galaxies?

6 votes

Position of protons and neutrons in a nucleus

5 votes
Accepted

When food cooks, does it gain energy?

5 votes

Would a gas "weigh" less than a liquid if they have the same mass?

5 votes

What is a joule? I find the definition confusing

4 votes

Why aren't rainbows blurred-out into nothing after they are produced?

4 votes

Why don't all objects bounce like rubber balls?

4 votes

Is this statement of conservation of charge circular?

4 votes

Can a black coating increase the efficiency of a heat dissipator?

4 votes

What causes ballpoint pens to write intermittently?

3 votes

How do resistors generate different heat if we make the current fixed and changed the voltage and resistance? Notice the flow of charge is constant

3 votes

Why don't humans perceive sound waves as twice the frequency they are?

3 votes

Why doesn't current pass through a resistance if there is another path without resistance?