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Have a Happy Thought:   One really cool thing about seeing footprints in sand, or mud, is coming up with a story of how those footprints were made. Was that dog running after its two humans, or was there one human with the dog, and another human walked by later?       Scientists recently have found much older footprints and are playing the same game, trying to figure out how, or if, the various beings that made these footprints interacted. Starting with the more recent: scientists have found and dated footprints in an ancient lakebed , and have realised that sets of tracks were left by two different hominin (human ancestor or relative ) species, and within at most a few days of each other! One set of footprints they belonged to a Homo erectus, and the other was left by a Paranthropus boisei (the term “australopithecine” may be more familiar to you , a more distant relative to modern humans ) . And these footprints were left about 1.5 million years ago – am...