/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: lemondemon411 https://cdn.slidesharecdn.com/profile-photo-lemondemon411-48x48.jpg?cb=1529348109 Hydrogen is a colourless, odourless gas which, if left alone in large enough quantities for long enough, will begin to think about itself.