A new dolphin speaker device could one day help us talk with these remarkably intelligent life forms, scientists say. Dolphins live in a world of sound far beyond our own. They can distinguish very small differences in the frequency or pitch of sound waves, and can hear and generate low-frequency sounds below 20 kilohertz that…
‘Tractor beams’ of light that pull objects towards them are no longer science fiction. Haifeng Wang at the A*STAR Data Storage Institute and co-workers have now demonstrated how a tractor beam can in fact be realized on a small scale. Tractor beams are a well-known concept in science fiction. These rays of light are often…
It’s called the transit of Venus. The planet will appear as little dark circle on the sun as it zips between us and that big yellow ball. About every 120 years or so, transits of Venus come in clusters – two in eight years. The last one was in 2004, and we won’t see another…
Crop diseases could be detected earlier and more easily if a new method that stamps a leaf with a colour-changing biosensor is successful. The Bill and Melinda Gates Foundation awarded $100,000 to Hideaki Tsutsui of the University of California, Riverside, to develop the early warning system for crop diseases. Tsutsui’s idea is to print biosensors…
Less than six months after the world agreed to craft a new climate pact by 2015, negotiations stumbled at a crucial preparatory phase as rich and poor countries butted heads. The concluding session of an already troubled 11-day haggle in Bonn ran into delays as countries clashed over who will chair the long negotiations, which…
Researchers have identified what they say are the oldest musical instruments in the world. The flutes, made from bird bone and mammoth ivory, were found in a cave in southern Germany. Carbon dating revealed the flutes to be between 42,000 and 43,000 years old. Scientists think the musical instruments may have been used for religious…
Organic molecules — compounds that on Earth can be linked with life — encased within Martian meteorites now reveal biological activity on the Red Planet could not have formed these materials, researchers say. Organic molecules are the carbon-based raw materials that building blocks of life such as proteins and DNA are made from. These organic…
Linguists know that languages change drastically over the course of a few thousand years, so drastically that there’s no telling what the original human language was like or how it came into being. Language consists of words, not rocks, so there are no linguistic fossils comparable to the fossils in rock that reveal ancient stages…
Four decades ago, a Massachusetts Institute of Technology computer model called World3 warned of a possible catastrophic course for human civilization in the 21st century – a collapse of socioeconomic order and massive drop in human population. In Limits to Growth, a bitterly disputed 1972 book that explicated these findings, researchers argued that the global…
Species don’t hang around forever. Homo sapiens has already notched up a mind-boggling 200,000 years on Earth. Is the end nigh? The geological statistics suggest not – the average mammal species celebrates its millionth birthday long before it begins to slip towards oblivion. But we are no average species, and there has long been a…