An IBM supercomputer developed for US government nuclear simulations, and to study climate change and the human genome has been recognised as the world’s fastest.

In a secret operation to secure nuclear material, the United States has helped Ukraine return to Russia enough uranium to build two atomic bombs.

AFTER more than a decade of work and $3.5 billion (e2.64bn), engineers have completed the world’s most powerful laser, capable of simulating the energy force of a hydrogen bomb and the sun itself.