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44 Challenging problems. Many are quite difficult, and tests if your physics understand is solid enough!
This is a tutorial on arXiv about how negative refractive index emerges.
Folding a square sheet of paper into an arbitrary 3D shape is proved to be NP-hard problem. It is proved by transforming the problem into circle packing problem[1].
[1] arxiv.org/abs/1008.1224: Circle Packing for Origami Design Is Hard
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If you think you can get good result for your exam, you may bet on it with Ultrinsic.
Scientists now attach probes into a living cells, and measure electrical currents from inside.
Vinay Deolalikar, HP Labs researcher, claimed to have proved NP not equal to P. The website is his homepage in HP. You can find his 103 paper in pdf here. And he said he will post the final version when ready. Here is his email claiming to have solved the problem:
Stocks are no longer mirrors of national economies; they are not — as is so commonly said — magical forecasting mechanisms. They are small slices of ownership in specific companies, and today, those companies have less connection to any one national economy than ever before.
A rebound in Chinese stocks, the worst performers in Asia this year, may be imminent after reaching a near-term low, CIMB Group Holdings Bhd. said, citing two technical indicators.
Another industry to watch: shipping. Baltic Dry index falled 31 days non-stop as China's demand for iron cre and steel fall. Shipping experts see no short term rebound in BDI too. Price of other commodities may fall too as China's fixed investment is decreasing.
Japan starts to sale banana using vending machine! But is there really so much people wanna eat banana? And will the banana go bad too quickly to be sold in the machine? We will see.