One small step: world's first welcome mat for aliens unveiled in Australia

If there is extraterrestrial life out there, why haven’t we found any yet? Perhaps it’s because we never invited them in
The planet’s first cosmic welcome mat – here to welcome extraterrestrial life to the Adelaide Convention Centre and the 68th International Astronautical Conference – seems comically small and slightly askew. It’s not that the mat itself is small: it’s standard doormat size, perhaps a bit larger. But conference venue entrances are built