Typos are careless spelling or punctuation mistakes. They are usually minor, but not always. Sometimes these small mistakes can cost millions of dollars. NASA, the US space agency, made a little mistake in 1962 that had a big impact. Their spacecraft, called “Mariner 1”, was launched in 1962 with the goal of flying by the planet Venus. The spacecraft was robotic, so there were no people onboard. Because of this, its navigation was controlled by software. Unfortunately, the person in charge of writing the software forgot one character – a hyphen. This missing hyphen caused the software to malfunction. The spacecraft exploded after takeoff, costing NASA $80 million!