Do I need to remove the battery when using my netbook?

It is not necessary to remove the battery when using AC power since the netbook provides a "trickle charge" to the battery while on AC. 

If, however, you plan to not use your notebook at all for several days, it is not a bad idea to remove the battery during extended periods of non-use. Just keep in a cool dry area.  

Battery life determined by the activity of the notebook. The battery life time frame will reduce when accessing the hard drive, wireless card, floppy drive, CD-ROM, modem, wireless, PC cards, high video resolutions, etc. These all affect the battery life expectancy.

Unfortunately there isn't a way to pinpoint battery life when using these devices. You can try draining and charging the battery for several cycles to see if the battery life improves.

Learned VS Learnt

What is the difference between "learned" and "learnt", and when should one be used instead of the other?

The *prescriptive* answer is:
"learned" should used in phrases such as "a learned professor", in which case it is pronounced with two syllables.
"learnt" should be used in phrases like "I learnt a valuable lesson today".

The *descriptive* answer in British English is:
"learned" is used in phrases such as "a learned professor", in which case it is pronounced with two syllables.
Either "learnt" or "learned" are used interchangably in phrases like "I learnt a valuable lesson today".

The *descriptive* answer in American English is:
There is no such word as "learnt". Use "learned" always.

Or to put it another way:

Active verb in the past tense: I learned French.
Past participle: I have learnt French.

This word is going through change. The word "cookt" used to exist.

Active verb: I cooked a pie
Participle: I have cookt a pie.

However, "cookt" is now obselete. I fear "learned" is going the same as we all confuse "leanrt" and "learned".

Learned (meaning educated) is an adjective in its own right (like "intelligent").

That's all folks. next time..

Ancient Stonehenge Ghost??

Ancient Ghosts
Uploaded by czoom. - Classic TV and last night's shows, online.

Tourist captures what looks to be a ghost of a child at the ancient Stonehenge burial grounds in old England.