BBC Focus Magazine

[Isee]

We often discuss the speed of light as a limit that cannot be broken. What other limits are out there?
Is zero kelvin one of them?

[M Paul Lloyd]

Yes zero Kelvin is generally viewed as a limit of absolute temperature, although in reality it is unachievable as it would require all movement at a subatomic level the stop completley and that just insn't going to happen in a universe with any energy in it.
So the limit of minimum temperature is a tiny bit above zero Kelvin.
Also the speed of sounds has a limit of sorts, depending on atmospheric temperature, density, humidity, pollution levels and such.
There are also limits to how fast you can travel through the atmosphere, below 20 kilometres altitude anything above three times the speed of sound (Mach 3) is impractical due to surface friction heating.

[...]

in science these unbreachables ie, light speed,are known as "constants" and i believe the "plank length" is one as is the gravitational constant....there are more, but ill leave that to the others

[Liam Sheppard]

although light speed has now been broken so never say never.

The memory capacity of the human brain, the intelligence of humans?

[Shadowwolf]

May have, jury is still out as far as I know.

[Healerman]

The memory capacity of the human brain, the intelligence of humans?

Perhaps...but the human capacity for stupidity is certainly infinite.

[Nails]

Re: breaking the speed of light, I remember watching a video where this physicist says that stellar explosions have been watched and measured without anything breaking the theoretical limit of c....

http://www.youtube.com/watch?v=7ImvlS8PLIo&list=LLC0hvwp_Jc0IyJei0g0u4DA&index=8&feature=plpp_video