Because under the terms of its government bailout, RBS has the right to sell new shares to the government at 50p per share, or roughly twice the current price (in technical terms, 50p is the conversion price of RBS's 'B' shares).

BBC: If RBS needs capital, taxpayers will suffer

Since uranium is 20 times cheaper to find than oil, (in terms of finding cost's share of sale price), the current price run-up has already spawned hundreds of exploration companies, where there were only a handful a decade ago.

FORBES: Yellowcake Fever