This summary provides the key details from the document in 3 sentences:
The document describes the similarities between how a walrus can climb icy surfaces and how flies can climb vertical glass surfaces, explaining that they are both able to do so through using their bodies to create a vacuum that allows atmospheric pressure to adhere their feet. It then provides an explanation of atmospheric pressure and how removing air from one side of a surface creates pressure, before relating this back to how walruses and flies are able to overcome gravity.
This summary provides the key details from the document in 3 sentences:
The document describes the similarities between how a walrus can climb icy surfaces and how flies can climb vertical glass surfaces, explaining that they are both able to do so through using their bodies to create a vacuum that allows atmospheric pressure to adhere their feet. It then provides an explanation of atmospheric pressure and how removing air from one side of a surface creates pressure, before relating this back to how walruses and flies are able to overcome gravity.