Mark

For instance, you have random cold and it's your friend's anniversary and you can't give him a gift personally, so you send it by postal service(your friend is indonesian for example). When he opens the package, will he catch that cold from the package?

So we have 2 light beams, A and B, pointed one towards the other, Now a particle of the A beam travels at the speed of light( c ), in the terrestrial refference; a particle of the B beam, also. Which means that a random particle travels a fixed distance in a time t.

But if we'd take the refference to be one of the beams, say A beam, then the Earth would travel at c and a particle of the B beam would travel twice c, right? which is not possible and, according to the physics laws(nothing can travel faster than c), which means than time would divide by 2 in order to decrease the speed by 2 (so the B particle travels at c). Now if time is divided by 2, then the time needed for a particle of B to travel the same distance d would be t/2.

Which means that a particle of B travels a fixed distance d in both t time and t/2 time.

How is this possible?

Let's say there is heavy water vapor and normal liquid water. What happens then: the vapor rests under the water or it acts like normal water vapor?

And another question: If we decrease enough the temperature of a heavy water ice cube, will it float on normal water?

I have two goldfish, one orange and one yellow. They have been living in the aquarium for 2 months now, but suddenly i noticed some black spots appearing on the yellow one. It's strange though the orange one has none. I changed the water, the filter , food and all stuff needed, but it's getting worse. The orange one seems to be normal.

the behaviour of the fish didn't change, just the colour of the skin.

What s wrong with my yellow fish?

We all are supposed to think that he is an old wise man, but what if it's not like this? What if God is a child??

(open question for religious and atheists)

I know that >5 mW green lasers are capable of permanent eye damage, but a violet laser (405 nm) is not entirely seen by the eye, so it can go more powerful, right?

I need some piano songs( especially movie soundtracks) that can be played on any occasion..? (ex. for a girl, at a party, in depression etc...)

I mean what does it help at and what it consists of?

je suis en premiere et j'aimerais bien aller en Australie et exercer la medecine la bas. Alors comment faire pour y aller soit pendant l'université, soit apres??

Merci en avance