Poor User Interfaces Really Do Kill People

From my new favorite online publication: The Risks Digest

[Due to] the crew’s misunderstanding of a laptop computer tool… The crew unwittingly transferred and used weight data from the aircraft’s previous flight while calculating performance criteria for the next take-off…. The aircraft failed to lift off after rotation and… All seven crew were killed.

So that’s why they don’t let you use your laptop during takeoff and landing!