Biology activities Autumn leaf display This Double Helix Science Club activity provides instructions on how to make an autumn leaf display. Banana DNA This Double Helix Science Club activity provides instructions on how to extract DNA from a banana. DNA model This activity from CSIRO's Double Helix Science Club provides instructions for making your very own DNA model. Flower power This Double Helix Science Club activity provides instructions on how to dissect a flower. Mushroom flowers This Double Helix Science Club activity provides instructions on how to make images of a mushroom using its spores. Need a hand? Try this activity from CSIRO's Double Helix to make a working hand from just a little cardboard and string. Paper seeds This Double Helix Science Club activity shows you how to make a type of paper that will grow into a plant! Pollen trap When spring is in the air, you might be able to take a closer look at pollen.
There is no proof in science, but there are mountains of evidence | How to... (Part of the How to Talk to a Global Warming Skeptic guide) Objection: Correlation is not proof of causation. There is no proof that CO2 is the cause of current warming. Answer: There is no “proof” in science — that is a property of mathematics. In science, what matters is the balance of evidence, and theories that can explain that evidence. Where possible, scientists make predictions and design experiments to confirm, modify, or contradict their theories, and must modify these theories as new information comes in. In the case of anthropogenic global warming, there is a theory (first conceived over 100 years ago) based on well-established laws of physics. Given the lack of any extra planet Earths and a few really large time machines, it is simply impossible to do any better than this. Aside: It is usually interesting to ask just what observations or evidence your skeptic would consider “proof” that global warming is caused by rising CO2 levels.
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