Do all wind turbines rotate in the same direction? If so, why?
The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
Observer business agenda
BP dropped its green pledges and turned back to oil. Now the price of crude has collapsed
At its AGM this week, the company will face not only the activist investor at its heels, but a global economy being changed from the White House
What I’ve learned after 40 years as the Observer’s science editor
Almost as amazing as the knowledge we have gained in the past four decades is the fact that some people continue to deny the damage we are doing to our world
