The Fifth Force
For decades, physicists have tried to find a single theory that describes the four forces holding the universe together. Recently, their progress has received a major upset; some researchers claim to have found a 'fifth force' - a form of anti-gravity. Physicist
John Taylor investigates the work of scientists who are climbing towers in Nevada, boring holes in the Arctic ice sheet and descending into
Australian mines in a search for something Einstein never dreamed of. A Formula for Safety?
Will new legislation on the use of toxic chemicals in the workplace put profit before safety? Two scientists who advise the Government argue that science is being used to lend authority to supposedly 'safe levels' that already lag behind international standards. Chemicals expert Alistair Hay investigates the system used to decide safety limits for the hundreds of chemicals used in industry. Producers
DANA PURVIS , DAVID MALONE
Executive producer DAVID PATERSON Series producer JANA BENNETT