They´re heeeere! Yes, aliens are wreaking havoc and destruction throughout the land. But these aliens are Arizona beetles, and the land is in California, where the invasive insects are a serious problem. And what of space-faring aliens? We have those too: how to find them, and how to protect our planet –“ and theirs. From Hollywood to SETI´s hi-tech search for extraterrestrials, aliens are invading Are We Alone?