SIXTH SENSE DEVICES

SixthSense

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Steve Mann wearing a camera+projector dome in 1998, which he used as one node of the collaborative Telepointer system 

Pranav Mistry wearing a similar device in 2012, which he and Maes and Chang named "WUW", for Wear yoUr World.

SixthSense is a gestures interface device comprising a neckworn pendant that contains both a data projector and camera. Headworn versions were also built at MIT Media Lab in 1997 that combined cameras and illumination systems for interactive photographic art, and also included gesture recognition (e.g. finger-tracking using colored tape on the fingers).

SixthSense is a name for extra information supplied by a wearable computer, such as the device called "WuW" (Wear yoUr World) by Pranav Mistry et al., building on the concept of the Telepointer , a neckworn projector and camera combination first proposed and reduced to practice by MIT Media Lab student Steve. 

LOGICAL QUESTION

WEIGHING IN A HARDER WAY

You've got 27 coins, each of them is 10g, except for 1. The 1 different coin is 9g or 11g (heavier, or lighter by 1g). You should use balance scale that compares what's in the two pans. You can get the answer by just comparing groups of coins.
What is the minimum number weighings that can always guarantee to determine the different coin.

2.

EINSTEIN'S BRAIN

Einstein's brain 

Einstein's brain was preserved after his death in 1955, but this fact was not revealed until 1986.

The brain of physicist Albert Einsteinhas been a subject of much research and speculation. It was removed within seven and a half hours of his death. The brain has attracted attention because of Einstein's reputation for being one of the foremost geniuses of the 20th century, and apparent regularities or irregularities in the brain have been used to support various ideas about correlations in neuroanatomy with general or mathematical intelligence. Scientific studies have suggested that regions involved in speech and language are smaller, while regions involved with numerical and spatial processing are larger. Other studies have suggested an increased number of glial cells in Einstein's brain.

When Einstein died in 1955, his body was cremated and his ashes scattered, as was his wish. However, before his body was cremated, pathologist Thomas Harvey at Princeton Hospital conducted an autopsy in which he removed Einstein's brain. Rather than putting the brain back in the body, Harvey decided to keep it, ostensibly for study. Harvey did not have permission to keep Einstein's brain, but days later, he convinced Einstein's son that it would help science. Shortly thereafter, Harvey was fired from his position at Princeton because he refused to give up Einstein's brain.

For the next four decades, Harvey kept Einstein's chopped-up brain (Harvey had it cut into over 200 pieces) in two mason jars with him as he moved around the country. Every once in a while, Harvey would slice off a piece and send it to a researcher. Finally, in 1998, Harvey returned Einstein's brain to the pathologist at Princeton Hospital.