Security experts say patterns of activity on the Internet could indicate that a new computer worm is about to attack.

FORBES: Ten Must-Read Tech Stories

Although many young Americans claim not to believe in the future of Social Security, it is hard to see their saving patterns changing accordingly.

ECONOMIST: The sorry state of saving

"It gives you the ability to print very fine metal patterns that could be used in biosensors or security features where you need to print a pattern and pass an electrical current through it, " said Mr Bishop.

BBC: NEWS | Technology | 'Magic ink' that makes metal grow

These patterns of self-recruitment and self-radicalisation are a headache for security services, who have no easy way to infiltrate close-knit, local groups that operate at first without foreign help.

ECONOMIST: Muslim extremism in Europe

Effects can include a degraded physical environment, less predictable weather patterns, and social disruption leading to a loss of a sense of community, continuity, security and autonomy.

ECONOMIST: Letters