What colour are plants? No, not a stupid question, but I bet you were tempted to answer ‘green’? Which is fair enough; chlorophyll is the major pigment in plants and consequently they do tend to appear green. But! This is almost a knee-jerk, Pavlovian, conditioned response because we are geo-centric in our thinking and experiences. What [...]

Waiting for ages for a bus to come along only for two to arrive at once is guaranteed to raise a frown, or worse. But, in this instance, two buses together are having a quite different effect. The buses concerned are two back-to-back ‘Letters’ that appeared on October 23 2011 in the journal Nature (Licausi [...]