Are redheads more sensitive to pain than brunettes? Taking down their particulars - is a job interview easier if the panel are naked? Indestructible objects - are they really? Brainiac Boffin Jon Tickle really pushes his luck; dog whistles - If we can't hear them, how do we know they work? If sports drinks get into your body faster, can they get out again quicker; after eating a kebab, which drink is best to cool your mouth? Can you see the stars during the day if you're at the bottom of a well? Modern art, the lazy man's way; explosives experts tackle the safe, and Fat v Thin continues.