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Physics, Astronomy & Cosmology / Can anyone hear you scream in Space?

« on: 03/10/2018 13:07:52 »

Dan says:

"In space, no one can hear you scream." I think we've all heard that quote.

The sun sends light to the Earth, and although space is near absolute zero, we still feel the heat from the sun here on Earth. So light is able to travel through space and maintain its heat, right?

Much like light travels, If an astronaut screams in their space helmet, would the sound energy leave the helmet and go into space? So if another astronaut was close enough, would they be able to hear the scream?

What do you think?

2

Physiology & Medicine / How does my body adjust to hot and cold weather?

« on: 03/08/2018 10:07:24 »

Angelo wants to know:

In winter, if the temperature reaches 5 degrees C, it almost feels like short sleeve weather.  If that happens in the summer, I'll look for a heavy jacket.  What changes in my body to acclimate between the seasons?

What do you think?

3

Physics, Astronomy & Cosmology / Does hot air gain potential energy when it rises?

« on: 03/08/2018 10:03:55 »

Aditi wants to know:

If potential energy increases with height, does hot air gain energy when it rises? And in turn, does its temperature continue to increase because of the energy?

What do you think?

4

General Science / How do card readers work?

« on: 03/08/2018 09:33:24 »

Paul says:

How do card readers work? I have just googled it and even on the banks' own sites they say "They create a unique password etc etc" but not really how they work and how it makes a transaction more secure.

What do you think?

5

Cells, Microbes & Viruses / What is Necrotising faciitis, and where did it come from?

« on: 03/08/2018 09:30:49 »

Bhavesh says:

The origin of Viruses like Necrotising facitis aka 'Flesh eating bug' How long have these viruses proliferated in nature? Do animals have an immunity? When was the 1'st recorded case in medical journals? Where can they be found in nature? I read someone in U.K contracted it near a sewage outlet pipe out near sea(in recent years)! What can we do to avoid such things? Are scientists close to a cure?

What do you think?

6

Cells, Microbes & Viruses / Do blood transfusions or organ transplants change DNA structure?

« on: 03/08/2018 09:20:13 »

Garth wants to know:

It is said that only identical twins have the same DNA structure, I would like to know if one's DNA structure is compromised in any way if one receives either a blood transfusion, or if one receives an organ transplant from someone else?

What do you think?

7

Physics, Astronomy & Cosmology / How fast would the earth spin if the moon was closer?

« on: 03/08/2018 09:16:14 »

Donald wants to know:

If we could pull the moon to the same orbit as the ISS, how fast would the earth spin? How fast would the moon-earth rotation spin? And how high would the tides be?

What do you think?

8

Physiology & Medicine / Do people have instincts?

« on: 03/08/2018 09:05:26 »

Evgeniya wants to know:

Do people have instincts? Or do we just have unconditioned and conditioned reflexes?

What do you think?

9

Physiology & Medicine / Why doesn't the skin on my hand and feet tan?

« on: 03/08/2018 09:02:04 »

Mike says:

I'm on my holidays and my wife asked why doesn't the skin on my hand and feet tan? I thought it was because the skin is thicker there.

What do you think?

10

Physics, Astronomy & Cosmology / Why do stars group into galaxies with vast distances between them?

« on: 27/07/2018 10:12:24 »

Lloyd wants to know:

Why do stars group into galaxies with vast distances between them?

What do you think?

11

Question of the Week / QotW - 18.07.29 - What is the minimum area required to sustain one human being?

« on: 25/07/2018 12:29:00 »

Charlie wants to know:

What is the minimum area required to sustain one human being in terms of food and oxygen?

What do you think?

12

Physiology & Medicine / Could we fatten up space crew to minimise food needed for long term spaceflight?

« on: 23/07/2018 12:35:26 »

Donald wants to know:

For long-term spaceflight, would it be reasonable to really fatten up the crew so eating calories isn't necessary? Saving on food, packaging, storage, diapers, etc.

What do you think?

13

Physics, Astronomy & Cosmology / Is the schrodinger wave equation used for full spin particles?

« on: 20/07/2018 12:33:09 »

Ali wants to know:

Is the schrodinger wave equation used for full spin particles?

What do you think?

14

General Science / Is zero an even number, odd number, or neither?

« on: 20/07/2018 12:21:35 »

Michael wants to know:

Is the number zero (0) an even number, an odd number, or neither?

What do you think?

15

Chemistry / How does an aluminium-CH3COOH battery work?

« on: 19/07/2018 11:52:19 »

Alin says:

I have tried making an aluminium-CH3COOH battery. I have taken aluminium from a can, graphite from a special drawing pen and vinegar that you can buy from the store.  In the middle there is the graphite electrode wrapped in a tissue soaked in vinegar and everything is wrapped in aluminium. Can somebody help me understand the process? I want to know the equation that takes place.

What do you think?

16

Physics, Astronomy & Cosmology / Why does my car accelerate uphill?

« on: 19/07/2018 11:44:47 »

Rudolf wants to know:

When I drive with a vehicle up a steep hill, (constant grading) and at a constant speed, why does the vehicle start to accelerate by itself when getting near to the top? Sometimes more than 200m before the top?

What do you think?

17

Plant Sciences, Zoology & Evolution / Can birds recognize earthworms when they're on the roads?

« on: 19/07/2018 11:37:23 »

Nikolaus wants to know:

In my garden, I see blackbirds picking into the soil and (sometimes) pulling out an earthworm. On rainy days, I see hundreds of earth worms on the pavement, yet no birds taking advantage of this free all-you-can-eat buffet. How come? Can birds not recognise earthworms by shape on the roads?

What do you think?

18

General Science / How long will a boiled egg last?

« on: 02/07/2018 14:45:01 »

Wayne wants to know:

Does boiling an egg affect the expiry date? If I boil it, does it have to be kept in the fridge if it is not eaten immediately?

How long will a boiled egg last?

What do you think?

19

Physiology & Medicine / What are possible treatments for hyperhidrosis?

« on: 02/07/2018 13:31:40 »

Don wants to know:

Why does hyperhidrosis happen? What are some ways to treat it?

What do you think?

20

General Science / Could we run out of musical notes?

« on: 29/06/2018 13:41:51 »

Dennis wants to know:

Could we run out of musical notes?
would we be able to use every combination of musical notes?

What do you think?