The passage discusses predictions for changes that may occur in the 21st century based on advances in technology. It suggests that the pace of life will increase with faster transportation like jets. Many tasks will be done remotely through computers and devices embedded in clothes and people's bodies. The most amazing development will be commercial space flights to Mars, which scientists believe can be habitable for humans with technology to artificially create livable conditions. The 21st century will bring many incredible changes through contemporary technologies that were unimaginable a century ago.