You can find a current listing of all the Science Observer news articles, plus book reviews, that I have written for American Scientist here: http://www.americanscientist.org/authors/detail/fenella-saunders
Here are few recent ones:
Power Gets Hot
Improved materials help convert waste heat into electricity
http://www.americanscientist.org/issues/pub/power-gets-hot
Minuscule Speed Traps
Rotating molecules experience the Doppler effect
http://www.americanscientist.org/issues/pub/minuscule-speed-traps
Bringing Up Robots
Machines learn to walk faster, and better, if they figure out crawling first
http://www.americanscientist.org/issues/pub/bringing-up-robots
