Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

A heavy key chain may deactivate the airbags in your Chevy Cobalt or Pontiac G5

GM is recalling 788,000 Cobalt and Pontiac G5 sedans for a potentially deadly problem with the ignition system. When the vehicles' keys are connected to heavy key chains (or, say, key rings laden with a dozen extra keys), a sufficiently extreme jolt or impact could shift the ignition out of the "run" position and into the "off" position. Cuts electrical power to the vehicles' systems, in turn deactivating the airbags.

Paris bans some cars to cut smog

PARIS is taking drastic measures to combat its worst air pollution in years, banning around half of the city's cars and trucks from its streets in an attempt to reduce the toxic smog that has shrouded the French capital for more than a week. Cars with even-numbered licence plates were prohibited from driving in Paris and its suburbs today, following a government decision over the weekend. Around 700 police were patrolling the morning rush-hour, handing out tickets to offenders.

Self-balancing electric unicycle – would you commute on this?

Going straight in at number one on the list of things we didn't expect to read today, the SBU V3 unicycle is coming to the UK. Thanks to London 2012 and Sir Side Burns, cycling has never been more popular in the UK. Now Eddyline Ltd - the sole UK distributors for the SBU V3 - is looking to…er…ride on the back this popularity by importing something with one less wheel.