SERIES WATCH Supernatural Science Pearl, 10.45pm Archaeologists and those fascinated by pre-history will be interested in this episode which tells of a new scientific technique that could rock the foundations of Judaism and shed light on major mysteries of pre-history, such as the origin of monoliths on Easter Island (above). Canadian geophysicist Graham Borradaile claims his method of determining the age of stone through analysis of its magnetic properties will enable archaeologists to unravel the truth of many an ancient story. This programme explains Borradaile's complex stone-dating process and its controversial applications. In Israel, for instance, archaeologists want to use it to show King David and Solomon never existed, by proving biblical structures they supposedly inhabited were not built until long after. Supersense World, 9pm Tonight's two episodes of this series reveal the sounds and smells that animals can pick up beyond the range of the human nose and ear. Most elephant conversations take place in a register too low for us to hear, whales use low frequency sounds to communicate over hundreds of kilometres, and spiders can home in on the wing beats of their prey. Salmon may be the most amazing, being led across oceans to the exact location of their birth by their super-sensitive sense of smell. In Search Of The Mimic Octopus National Geographic, 9pm The mimic octopus is another animal that performs incredible feats. All octopuses are masters of disguise, able to alter their texture, skin and shape to blend with their surroundings. But this possible new species can also change shape to resemble other marine creatures. In this documentary, biologists go in hot pursuit of the elusive eight-legged creature in the waters of Indonesia, to find out if it really is a new species, or just a known one in a particularly clever disguise.