If your kid is mathematically gifted, I suggest pointing him (or her :-) to the nearest "relative value arbitrage" fund, rather than grad school in physics :-) With the glut of money heading into hedge funds, I've been told that the number one shortage is in investment ideas! You can see this in the graph below - the variation in returns is going down as more and more funds pile onto similar strategies.
Institutional Investor's obsessively read list of most-highly-paid hedge-fund managers starts with familiar names (George Soros: $750m), but 16 others made at least $100m in 2003... Successful managers become rich, possibly too rich to care about work, in just a few years.
I've discussed the role these funds are playing in the bond market, plying the carry or curve-flattening trades: sell the short end and buy the long end of the yield curve. Hedge funds are the third largest holders of US Treasury debt after Japan and China.