We seem to be living a sweet moment for manned exploration missions to Mars. There are several projects underway, both by private companies and space agencies, which aim to be the first to put a human being on Mars. Does this mean that we are now going to make the ancient dream of stepping on Mars come true?

[caption id="attachment_44056" align="alignleft" width="320"] Illustration by Moisés Mahiques[/caption] A few days ago, the writer of a radio programme wrote to me asking if I would like to comment on a scientific study on the air. The study said that oral sex reduced the risk of cancer.