Video This is what it looks like to cause an avalanche, get buried in it, struggle to breathe for four long minutes, and then get dug out. Now that’s what I call reality television.
An awesome bit of flash to help you comprehend the scale of everything in the universe. I recommend zooming out by scrolling to the right, then slowly zooming in all the way to the left, in order to really comprehend the insane smallness of the Planck length:
“It’s never the right time to have kids, but it’s always the right time for screwing. God’s not a dumbshit. He knows how it works.”
Last week I asked how a day could last 48 hours. It’s not really much of a puzzle because if you can follow the reasoning in the initial statements it’s pretty clear what’s going on. I just thought it was interesting to meditate on!
Everyone should go and see The Princess and the Frog. Here’s why.
Pixar worked incredibly hard to prove the viability of CG as a storytelling medium, and as a result had a string of huge successes. Meanwhile Disney made some pretty bad 2D animations from 2000-2004 and were making serious losses (failing even to create characters that made for good merchandise). Making a classic confirmation bias correlation/causation error, Disney execs concluded that the public preferred 3D to 2D (when in fact everyone just prefers good films to bad), and officially gave up on it in 2004.
John Lasseter, a driving force behind Pixar’s creative success, became ‘Chief Creative Officer’ for both Pixar and Disney animation when Disney purchased Pixar in 2006. He understood what was happening and reversed the decision. The first real fruit of that realisation is The Princess and the Frog, which has been out for a couple of weeks now.
I highly recommend everyone goes to see it. Not just because it’s a good film (and a superb showcase of the strength of the 2D medium), but as a vote for the very medium itself.
“Most problems are side effects of solutions to other problems.” – Eskil Steenberg
Once you have built a machine or robot that can do something, the really cool part is you can then see how fast it can do that thing. In the case of this astoundingly dextrous robot hand, the answer is: alarmingly fast.
A simple idea – a picture representing the earth, the moon, and the distance between them, in the correct proportion.
(Click for description and links to bigger versions):
Last Week’s puzzle
Why are ~10% of people left-handed?
Implicitly, the question is really why 10% instead of 50% or 100%, either of which would be intuitively more obvious (although you’d still wonder why it was one out of those two).
A frequently given answer is that in combat there is an advantage to having a handedness that most others don’t have, since you will be practiced at fighting opposite-handers whereas most of the competition will be practiced against fighting same-handers. An increased number of left-handed players succeeding in adversarial sports such as tennis is cited as evidence.
What’s fascinating about this argument is that it manages to sound convincing but it cannot possibly be the whole answer. If there was an advantage to being in the minority, and if that trait is genetic, then we would expect that over evolutionary time-scales a 50/50 split would emerge. (If fewer are left-handed and have a survival advantage by this argument, then more of the next generation will be left-handed, and so on until no advantage remains).
For the theory to work, there would need to be an evolutionary pressure that goes the opposite way, making left-handedness disadvantageous in some way, with the net effect of the two pressures to be a 10% incidence rate.
As it turns out, it seems we don’t have a definitive answer, but surveying the various theories and research presented in this wikipedia article below it seems to be connected to asymmetry in brain development (a deeper question in itself), with cultural effects (such as fighting) giving an additional skew in the short term.
This Week’s puzzle
There’s a very nice puzzle in quantum information theory. This is my attempt to set the same puzzle in less specialist terminology, and although it ends up being quite long, it does involve a magical ground squirrel.
There is an island in the centre of a large lake.
On the island is the entrance to a tunnel that goes deep underground to the imp underground city.
To the North and South of the lake are two evil imp warrior training centres.
To the East and West of the lake are two good imp warrior training centres.
There has recently been an imp general election, and they will either have elected a good leader or an evil one. 1,000 imp warriors will now be allocated a training centre, with exactly 500 allocated to each one. So, if an evil leader has been elected, 500 imp warriors will be assigned to the North training centre, and 500 the South training centre. If a good leader has been elected, 500 imp warriors will be assigned to the West training centre, and 500 to the East training centre.
You are a magical ground squirrel that lives on the island.
A pair of bridges connect the island to the lake shore in opposite directions.
Your magical power is exactly this: you can rotate the pair of bridges so they lie in any direction from the island, so long as they remain directly opposite one another. So you could choose to have one bridge head directly North and one directly South, or one directly North-West and the other directly South-East, and so on. However, you must never use your magic when an imp is on the island or a bridge, as they will notice and put you in their magical animal zoo.
The 1,000 imp warriors are about to be sent out, one each hour, to go to their respective training centres. Imps are highly random creatures, and they also have a pretty amazing sense of direction. They will be coming out in a random order, and they will head along the bridge that most closely matches the direction of their training centre. If the bridges seem to be perpendicular to the direction they want to go (for example, if the bridges lie East and West and the imp wants to go North) then the imp will pick a bridge at random.
Using only your magical ground squirrel powers, what is the best way to work out whether the imps have elected a good or evil leader?
(Note: this is not intended as a lateral thinking puzzle! You just have to decide how to rotate the bridges and interpret the resulting imp behaviour. But I suppose you could try solving it laterally as well. P.S. Imps can cross a bridge in under half an hour).
“There are 10^11 stars in the galaxy. That used to be a huge number. But it’s only a hundred billion. It’s less than the national deficit! We used to call them astronomical numbers. Now we should call them economical numbers.”
A puzzle Last time I asked if there were more households with dogs or with cats.
According to the data available to me (which covers the UK excluding Northern Ireland), 23.1% of UK households have 1 or more dogs, and 23.2% have one or more cats. So the answer is cats, but by an almost unbelievably small margin.
(6.1% of households have 1 or more cats and 1 or more dogs; there are about 14.7 million dogs and 17.7 million cats).
This week’s puzzle is a classic: the paradox of value.
Water is generally much more useful than diamonds, yet diamonds are more expensive by a gargantuan factor. Why is this?