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20 years ago, on the eve of the Velvet Revolution, Communist Czechoslovakia churned out tractors, Skoda cars, and – Semtex. The lethal and highly portable plastic explosive is still being manufactured in the Czech Republic and only there. The BBC’s Tim Whewell explores the legacy of Semtex.

See also

• November 17, 2009 -- Entire program – November 17, 2009
• November 17, 2009 -- President Obama in South Korea
• November 17, 2009 -- US and China ‘to work together’
• November 17, 2009 -- Alex the Jester