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John Oliver's shops have closed, their website no longer exists and the phone has been disconnected. I recall purchasing some from a Dulux paint shop a year or two ago, but cannot remember which one. Any hints would be greatly appreciated.

Good question. Simple answer: in physics there is no limit how high the density of photons can be. Photons are considered to have zero dimensions - to be infinitely small. You could have an infinite amount of energy in a single point. in fact, that is the basis for our idea of the big bang...

Good question. Simple answer: in physics there is no limit how high the density of photons can be. Photons are considered to have zero dimensions - to be infinitely small. You could have an infinite amount of energy in a single point. in fact, that is the basis for our idea of the big bang...

Good question. Simple answer: in physics there is no limit how high the density of photons can be. Photons are considered to have zero dimensions - to be infinitely small. You could have an infinite amount of energy in a single point. in fact, that is the basis for our idea of the big bang...

Good question. Simple answer: in physics there is no limit how high the density of photons can be. Photons are considered to have zero dimensions - to be infinitely small. You could have an infinite amount of energy in a single point. in fact, that is the basis for our idea of the big bang...

Good question. Simple answer: in physics there is no limit how high the density of photons can be. Photons are considered to have zero dimensions - to be infinitely small. You could have an infinite amount of energy in a single point. in fact, that is the basis for our idea of the big bang...

Good question. Simple answer: in physics there is no limit how high the density of photons can be. Photons are considered to have zero dimensions - to be infinitely small. You could have an infinite amount of energy in a single point. in fact, that is the basis for our idea of the big bang...

Good question. Simple answer: in physics there is no limit how high the density of photons can be. Photons are considered to have zero dimensions - to be infinitely small. You could have an infinite amount of energy in a single point. in fact, that is the basis for our idea of the big bang...

Sorry Chris, there is enough info. Assumuing there is no air resistance, you know that the ball was falling under gravity for half of its flight, so 2.5 seconds s= 1/2 * 9.8 * 2.5^2, where s = the maximum height of the ball. Once you know how far it fell, you can find how fast it was falling...

I think that the rate of emission, relative to its size, of a black hole increases as the size decreases. So I think that Hawking is assuming an exponential (?) cascade of this escalating effect once the size of the black hole was quite small. If you consider that all of the mass ends up...

First you use a sophisticated mathematical technique called "division" to find the change in length per degree so, considering that the rod changed from 27.5 to 100, it changed by (100 - 27.5) 8.61 * 10^-4 / (100 - 27.5) meters/degree then, knowing the meters' per degree, it shrinks at that...

direction of travel? There seem to be lots of them on the outside (not axle-side) of the tube, and occasionally one leaks air. They are patchable. The tubes are not so old, and do not appear to be dry-rotted. This is on a 700 mm x 32 mm wheel on a road bike. I do have a puncture-resistant...