Archive for August, 2008

Exploring the function of sleep

Wednesday, August 27th, 2008
Is sleep essential?

Weeding Out Your Worries

Tuesday, August 26th, 2008


Depression brings with it plenty of worries.

“Worry gives a small thing a big shadow.” Swedish proverb.

I like to think of worry as a weed. Unless it is dealt with, it can infiltrate every aspect of thinking and be all consuming. Chronic worry can paralyze the ability to make decisions, produce fear about the future, about health, relationships and other peoples’ perceptions of you, and cause prolonged periods of stress. It is a common feature of depression, and also the basis of anxiety disorders that are separate from, and also coexist with, depression. Worry, anxiety and depression are close friends.

“Love looks forward, hate looks back, anxiety has eyes all over its head.”
Mignon McLaughlin

Worry predicts the bleakest results, the least desirable outcomes. And sometimes worry is a mind-set without a target; we’re not really sure what there is to be so uneasy about.

“Today is the tomorrow we worried about yesterday.”
Author Unknown

The positive news is that you can challenge worry. A good technique is mindfulness.

During the day our minds constantly make decisions and weigh up options – everything from the mundane to the most important. A good healthy thought in response to an option empowers us; worrying about the option is unsettling. Worries aren’t normally realistic but powered by imagination and fear. We imagine ourselves in all sorts of unpleasant situations, like being rejected by someone we respect, not measuring up, fearing that someone we love will be in an accident, or that our work is not up to scratch. This is worry, and needs to be identified as such.

Being mindful of worry simply means that we realize it is there, it is affecting our thoughts, and influencing our actions.

Challenging worry is what we do once we are mindful of it. This is when we take our thoughts back – you can’t cut out worry from your thoughts without first challenging it. As with anything in life, from riding a bike, to cooking, to any kind of hobby – challenging worry takes practice. When you feel your thoughts being led by worry, begin to imagine all the millions of times that things worked out okay, when you succeeded at what you tried.

“Do you remember the things you were worrying about a year ago? How did they work out? Didn’t you waste a lot of fruitless energy on account of most of them? Didn’t most of them turn out all right after all?”
Dale Carnegie

If “what-ifs” are all you can think of, challenge those thoughts too. You can begin to actively “what-if” into the positive realm, where things are okay. What would it look like if things went the most ideal way? How would you look and behave?

Identifying your worries and challenging them will help you reclaim your mind, cutting out the weeds one worrying thought at a time.

“It ain’t no use putting up your umbrella till it rains.”
Alice Caldwell Rice

Brain study could lead to new understanding of depression

Tuesday, August 26th, 2008
Brain scientists have moved a step closer to understanding why some people may be more prone to depression than others.

Blinking liars!

Monday, August 25th, 2008
Monitoring the speed at which someone blinks could be enough to give away whether they are lying or not.

Cocaine: How addiction develops

Monday, August 25th, 2008
Using genetic engineering, researchers have now been able to selectively switch off those protein components in dopamine-producing neurons that are integrated into the receptor complexes under the influence of cocaine.

Aboriginal kids can count without numbers

Sunday, August 24th, 2008
Knowing the words for numbers is not necessary to be able to count

Complex decisions? Don’t sleep on it

Sunday, August 24th, 2008
Neither snap judgments nor sleeping on a problem are any better than conscious thinking for making complex decisions

Researchers link cocoa flavanols to improved brain blood flow

Saturday, August 23rd, 2008
New study suggests cocoa compounds could hold promise for stroke

Killer carbs – Scientist finds the key to overeating as we age

Saturday, August 23rd, 2008
A Monash University scientist has discovered key appetite control cells in the human brain degenerate over time, causing increased hunger and potentially weight-gain as we grow older.

Flat-panel ion thrusters

Friday, August 22nd, 2008
You may think spacecraft thrusters need to be big and powerful, but Brian Gilchrist and colleagues at the University of Michigan in Ann Arbor, are thinking small. They propose that tiny "nano thrusters" could be made into flat sheets mounted on the side of spacecraft.

Conventional ion thrusters used for manoeuvring vehicles in space are roughly fridge-sized and work by accelerating gas ions to generate force in the opposite direction. But they waste a lot of gas and are limited in lifetime because the accelerated ions damage the engine.

Their nanothrusters, say the Michigan team, get around these problems. Each consists of a small chamber of fluid with electrodes inside and a vent at the top. Above that vent more electrodes generate a powerful electric field.

The fluid contains nanoparticles just tens of nanometres across that are ionised by electrodes in the chamber. Those charged ions are accelerated by the electric field and ejected from the vent, producing thrust.

These nanothrusters can be used in large numbers on flat panels with micro-scale fuel delivery channels. The panels would cover large areas of spacecraft and in the drag-free space environment give all vehicles fine and efficient control.

The inventors hope the flat-panel thrusters will reduce the cost of spacecraft thanks to their efficiency and light weight, cutting the cost of launching vehicles into space.

Read the full flat panel ion thruster patent.

Justin Mullins, New Scientist consultant