Chris Christie is making a second try to drive a natural gas pipeline through a protected wildlife reserve.

In remote US national parks, fish have high levels of mercury. That's because it spreads through the air.

I wonder if some of the mercury in Alaskan parks came from Chinese coal-fired electric plants.

A new medicine that reportedly cures hepatitis C costs $84,000, which means most of the people who need it can't afford it.

If you can hold out 20 years or so, till the patent expires, the price may come down.

Twitter is moving aggressively to extract personal information from its users, for profiling purposes.

It may be necessary to develop rules for safe use of Twitter. I am no expert, but I suggest these rules.

1. Use only tweets (no private messages).
2. Conceal your geolocation.
3. Don't mention what you personally are doing. Tweet only your views and comments on larger issues, or things that you witness.

I hope that people who know more will suggest additional rules.

Turkish Official Says Twitter Will Help Remove "Malicious Content".

This means recordings purporting to reveal corruption of officials.