pgreenwood

17 ms·

151.
by pgreenwood 8y ago
A critical characteristc of Penrose tiles is that they are aperiodic. These space filling prisms do not have that property. Look up the Schmitt-Conway-Danzer tile for an example of one that does.
152.
by pgreenwood 8y ago
1. Describe the problem you're trying to solve. 2. Describe your approach to solving it. In general, have something to say, know your stuff, and the rest will flow naturally.
153.
by pgreenwood 8y ago
It's an open problem to find a single aperiodic tile. It's called the Einstein Problem. https://en.m.wikipedia.org/wiki/Einstein_problem
154.
by pgreenwood 8y ago
A similar idea appeared over 20 years ago as joke. More specifically as a Chindogu, the comical Japanese artform of creating almost but not quite useful inventions to solve everyday problems. http://www.asiaone.com/static&#x
155.
by pgreenwood 8y ago
If this drivetrain achieves its claims I will be very impressed. Shaft drive designs have been around for as long as chain drives; and they have never been as efficient. So mush is lost in the torsion of the shaft. A 2% increase in efficien
156.
by pgreenwood 8y ago
That's a Bill Hicks quote.
157.
by pgreenwood 8y ago
No cross-caps here. The first puzzle is a torus, the second a Klein bottle. Informally: the Klein bottle has on pair of edges is glued with a twist and one without; with the cross-cap, both pairs of edges are twisted then glued.
158.
by pgreenwood 9y ago
Ok I re-ran setting T properly for both cases. The results were similar: > poisson.test(c(1, 11800), c(3, 1000000), alternative = c("two.sided"),conf.level = .93) Comparison of Poisson rates data: c(1, 11800) time base: c(
159.
by pgreenwood 9y ago
Facinating, thank you. Particularly the part about multiplying the CI. I wonder if the analysis could be resuced to some extent? I feel there must be a way to use the information we have do draw some conclusions, at least relative to some e
160.
by pgreenwood 9y ago
Hello! I'd be interested to hear what you think the correct interpretation of these CIs are in this case. Failing that can you explain what is wrong with saying something like "with xx% confidence we can conclude that the rate is
161.
by pgreenwood 9y ago
I'll have a go at seeing what we can conclude from the data. Others, check my thinking please . Now we have 1 death in 3m miles for Uber, versus 1.18 deaths in 100m miles for sober drivers. The expected rate for 100m miles for Uber is
162.
by pgreenwood 9y ago
The ring system of Saturn (and others) aren't a bad start.
163.
by pgreenwood 9y ago
Check out the Apollo 11 landing site: https://www.google.com/maps/space/moon/@0.6813909,23.4602739...
164.
by pgreenwood 10y ago
Almost every bicycle. Our noblest invention.
165.
by pgreenwood 10y ago
You can configure Gimp so that UI is very similar to Photoshop. For example, check out these options: http://doctormo.deviantart.com/art/Gimp-2-8-Photoshop-Tweaks... http://lifehacker.com/how-to-make-th
166.
The Radical Plan to Eliminate Earths Predatory Species(io9.gizmodo.com)
7 points by pgreenwood 10y ago|0 comments
167.
by pgreenwood 10y ago
I agree that monetary subsidies tend to simply get capitalized into higher prices, but if you read the article the proposal is to actually build 2,000 units.
168.
Milestone in solar cell efficiency by UNSW engineers(newsroom.unsw.edu.au)
4 points by pgreenwood 10y ago|0 comments
169.
by pgreenwood 11y ago
We could do a lot better than planting 1 per second. How about planting 900,000 trees per day via aerial bombardment? http://www.theguardian.com/uk/1999/sep/02/paulbrown
170.
by pgreenwood 13y ago
Last night I had dinner with my parents. They lamented that they could not find a phone for my elderly grandmother. They just need something that just makes and receives calls, is dead simple, has (very) large buttons, and is loud. Where is
171.
by pgreenwood 13y ago
Bacterial antibiotic resistance increases with exposure to the antibiotic. With targeted treatment there is less exposure for a given clinical effect. Therefore lower resistance.
172.
by pgreenwood 13y ago
There's considerable promise in phage therapies as an alternative to antibiotics. And they may well not suffer the same problems of resistance since phages are targeted to specific bacteria.
173.
by pgreenwood 13y ago
Some say the downvoters all died under mysterious circumstances.
174.
by pgreenwood 13y ago
Perelman as an example not famous and non-notable? Wow, I am stuggling to think of a more famous or notable mathematician alive on the planet today.
175.
by pgreenwood 13y ago
I don't really believe in geniuses, but I believe in works of genius. Works of genius are at least potentially producable by a large proportion of the population, but not with any reliable frequency. Perhaps then a genius could be defi
176.
Hardening Sprints. What are they? Do you need them?(swreflections.blogspot.com.au)
1 points by pgreenwood 13y ago|0 comments