Monday, February 28, 2011

Yet Another Thing That Gives Me Nightmares 05

How To Turn A Laser Into A Tractor Beam

Physicists work out how to generate a backward pulling force from a forward propagating beam


Chen and buddies say this is possible when the system meets two conditions. First, it works only for beams in which the momentum in the direction of propagation is small, as is the case for beams that merely glance off an object. Second, the photons must simultaneously excite several multipoles within the particle, which scatter the beam.

If the scattering angle is just right, the total momentum in the direction of propagation can be negative, meaning the particle is pulled back towards the source and the light becomes a tractor beam.


This is a theory paper so there's one piece of the puzzle left to fit. All they have to do now is demonstrate that their tractor beam works.

Via Technology Review

Happy Birthday to me

Wednesday, February 16, 2011

Thursday, February 03, 2011

What Kind of D&D Character Would You Be?

I Am A: Chaotic Neutral Human Bard (3rd Level)

Ability Scores:







Chaotic Neutral A chaotic neutral character follows his whims. He is an individualist first and last. He values his own liberty but doesn't strive to protect others' freedom. He avoids authority, resents restrictions, and challenges traditions. A chaotic neutral character does not intentionally disrupt organizations as part of a campaign of anarchy. To do so, he would have to be motivated either by good (and a desire to liberate others) or evil (and a desire to make those different from himself suffer). A chaotic neutral character may be unpredictable, but his behavior is not totally random. He is not as likely to jump off a bridge as to cross it. Chaotic neutral is the best alignment you can be because it represents true freedom from both society's restrictions and a do-gooder's zeal. However, chaotic neutral can be a dangerous alignment because it seeks to eliminate all authority, harmony, and order in society.

Humans are the most adaptable of the common races. Short generations and a penchant for migration and conquest have made them physically diverse as well. Humans are often unorthodox in their dress, sporting unusual hairstyles, fanciful clothes, tattoos, and the like.

Bards often serve as negotiators, messengers, scouts, and spies. They love to accompany heroes (and villains) to witness heroic (or villainous) deeds firsthand, since a bard who can tell a story from personal experience earns renown among his fellows. A bard casts arcane spells without any advance preparation, much like a sorcerer. Bards also share some specialized skills with rogues, and their knowledge of item lore is nearly unmatched. A high Charisma score allows a bard to cast high-level spells.

Find out What Kind of Dungeons and Dragons Character Would You Be?, courtesy of Easydamus (e-mail)