Television preview RECOMMENDED VIEWING THIS WEEKEND

Pssst... Want to clean up in clubland? Want to become a Bertolucci of the chill-out lounge? Here's how. Buy in the out-takes from any self- respecting wildlife/ travelogue film-maker, commission a very long score from some ethnic musician (payable in local currency, preferably). Bring the two together and then slap on a pseudo-mystical title - the local lingo for "balance of life", "life in balance", that sort of thing.

What you would then have is a cheapo, cynically-devised imitation of Ron Fricke's Baraka, a montage of beautiful images (mountains, tribespeople etc) scored by the musician Michael Stearns. Baraka is an ancient Arabic word meaning "blessing" or "breath of life", and ravers reaching their weekly epiphany on Ecstasy might find something deep and meaningful in it all. Fricke's film is part of The Techno Trip (Sat C4), a late-night assembly of programmes devised to "offer everyone the opportunity to experience the ambient atmosphere of a club's chill-out lounge in their very own living room". In which case, chill-out lounges are obviously very erudite and self-analytical places. Rave New World, for example, is a not uncritical Equinox repeat dissecting Ecstasy and the concomitant rave scene, while Colours of Infinity introduces the layperson to the complexities of fractal mathematics. Parents, your teenagers are in good hands.

Which is more than can be said of the parents of Tennessee, USA, who very nearly found that evolution was off the school curriculum and creationism was in. Apparently, nearly half of all Americans believe that the world was created in six days, which idea, according to Everyman: Science Friction (Sun BBC1), Christians picked up from the ancient Babylonians. Now Christian fundamentalists want this "truth" taught in schools. It's that old monkey debate again, and Everyman charts the battle.

Equinox (Sun C4) ponders a different sort of ancient riddle - namely why Egyptian mummies should contain traces of cocaine and nicotine, thousands of years before the tobacco and coca plant were "discovered" along with the New World. Could it be that the Ancient Egyptians had established unrecorded trade links with South America? Makes you wonder, though. Is this how the pharoahs were able to afford to build their pyramids? Were these wonders of the ancient world little more than pre-Roman versions of the cocaine baron hacienda? More seriously, perhaps, did you know that 16th-century Europeans were in the habit of eating the ground-up flesh of mummies?

The weekend's big new drama is a rather good two-part police thriller, Harpur and Iles (Sat and Sun, BBC1) set in Wales and with more bent coppers than a GF Newman drama. Hywel Bennett, in his rather porcine post-Shelley disguise of beard and greasy slicked-back hair, stars, assisted by Patrick Robinson, from Casualty, and a certain Aneirin Hughes, who I can see becoming a bit of a TV heart-throb. Perhaps he'll become a gay icon, too, who knows. Coronation Street is the last of the Celluloid Icons (Sun C4), for all the obvious reasons - strong women, camp dialogue. Interestingly, all the gays and lesbians here are resistant to the idea of Granada introducing a gay character into the soap. You can see why. Surrounded by Raquel, Alec Gilroy, Audrey et al, he or she would look implausibly straight.