The MRI scanner measures this signal difference and displays the activity as a colored area (Figure 1). Diffusion Tensor Imaging (DTI) is a technique that detects how water travels along the white matter tracts in the brain (Figure 2). White-matter tracts connect different parts of the brain and must be protected during surgery. A dye (contrast agent) may be injected into your blood stream.
Quick Answer. Diving bell spiders of the species Argyroneta aquatica have the ability to swim, and they use this adaptation to live underwater. Although they live and swim in the water, diving bell spiders still breathe air by creating air pockets underwater that they use as homes. Continue Reading.
Huntsman spiders(Sparassidae family)Huntsman spiders are widespread in Australia. They are famous for being the bit (up to 15cm leg-span) scary, hairy, black spiders bolting out from behind the curtains. In reality, they are reluctant to bite and more likely to run away when approached and their venom isn't considered dangerous for humans. Their danger comes more from causing accidents by the terrified drivers who react to a huntsman jumping out from behind the sun visor or dashboard of a car when it's in motion. Despite their intimidating size, huntsman spiders can be an ally in the house; they help with pest-control by eating smaller insects.