Making Crop Circles
While most people consider crop circles to be associated with aliens trying to contact us, many of them were actually created by people in an attempt to contact alien beings. Those who made these crop circles reasoned that such large symbols would be perfect to attract the attention of any passing foreign spacecraft.
Creating Computer Programs To Translate Alien Languages
One of the problems that might arise if we ever do contact aliens is understanding any communications they send. This has led to Dr John Elliot of SETI trying to develop a special computer algorithm that will be able to detect whether signals received from space are actually just random impulses or deliberate communications.