Intermediate Word:  levigate (a) to irrigate  (b) to elevate  (c) to flatten  (d) to grind to a fine powder
Difficult Word: - fastigate  (a) one who has fasted to the point of emaciation.  (b) tapering to a point  (c) very discriminating  (d) exiguous

Climate Change Will Affect Carbon Sequestration In Oceans, Model Shows - SpaceDaily  An Earth System model developed by researchers at the University of Illinois at Urbana-Champaign indicates that the best location to store carbon dioxide in the deep ocean will change with climate change. The direct injection of carbon dioxide deep into the ocean has been suggested as one method to help control rising carbon dioxide levels in the atmosphere and mitigate the effects of global warming. But, because the atmosphere interacts with the oceans, the net uptake of carbon dioxide and the oceans' sequestration capacity could be affected by climate change.     
Keeping ageing brains alert  - BBC   Older people should get out there and get the heart pumping if they want to stay sharp of mind, scientists say. Studies of the ageing brain have shown mental decline is not inevitable. A healthy diet, aerobic exercise and mental stimulation all helped to keep the mind young, researchers emphasised at a conference in Dublin. Aerobic exercise as a vital contributor to maintaining brain function as the body ages. He noted one study in which over-60s who exercised over a three-year period exhibited none of the usual mental decline in that time. In another study, test subjects obtained mental improvements after just four months of a moderate aerobic training programme. Exercise increases production of key brain chemicals which encourage the growth of brain and nerve cells and the development of new neural connections. It also promotes the growth of blood vessels. Only ten hours of training in memory, problem-solving, and decision-making tasks took a decade off the cognitive ages of 3,000 volunteers in a recent study. Continued learning and mental stimulation "literally grow your brain."

Liquid drop takes big nano step  - BBC  Left:  (1) The drop sits on a surface coated with an extremely thin layer of nanomachines. Each nanomachine is little more than a nanometre in size (a millionth of a millimetre). These molecules essentially look like rods with rings that furiously slide back and forth.(2) When the light is switched on, a chemical reaction pushes all the rings down to one. The surface then changes; it ceases to be repulsive and becomes attractive end.. This alters the nature of the surface tension in the drop and it begins to move.  Edinburgh scientists have made a small blob of liquid move across a surface by shining a light in front of it. The team envisages this technology moving biological samples around a diagnostic chip to detect disease. The researchers can also see their work leading to smart materials that change their shape at the flick of a switch. "The properties of every drug, every polymer and every catalyst are just based on their static or non-smart properties. When we learn to do the same as nature, you really will have materials that today just sound like science fiction."       

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