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...become a powerful resource for modern forensic science, and have even allowed old, unsolved cases to be reviewed with fresh evidence. When a person dies their DNA will begin to degrade, but this can take a long time. In fact, some tissues can provide DNA samples even after a body has been buried for some time. Bone and dental pulp, for example, are sometimes used as a...

...become increasingly rare, but a very few reach out even beyond the Moon’s orbit and are lost to Earth. The connected environment A Perfect Planet emphasises how different elements of our environment are interconnected. The atmosphere responds to varying heating by sunlight, driving movement. These motions in the troposphere are what we experience as wind. The oceans...

...become apparent. These highly concentrated energy sources soon displaced wood, wind and water in the homes, industries and transport systems of the industrial nations. Today the fossil fuel trio of coal, oil and natural gas provides around 80% of the world’s energy. Concerns about the adverse environmental and social consequences of fossil fuel use have been voiced...