Experience with iron filings. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Experience with iron filings. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Use a hacksaw or file to prepare a small amount of iron filings. Pour them on a piece of paper or thin cardboard and put a strong magnet under them.

When moving the paper over the magnet, the sawdust will begin to create different patterns. The sawdust tends to line up along the magnetic lines of force. As the paper moves, these patterns change. Thus, with the help of sawdust, it is possible, as it were, to make the magnetic field visible, or rather, its individual lines of force.

Author: Rabiza F.V.

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Random news from the Archive

Poverty and stress remain in the genes 02.11.2012

The University of British Columbia and the Center for Molecular Medicine and Therapy, in a joint study, showed that childhood poverty and stress, along with demographic characteristics - age, gender and ethnicity - leave an imprint in the human genes. This trace may play a role in our immune response. The study, published in a special issue of the Proceedings of the National Academy of Sciences, explores how experiences immediately after birth and in the early years of life can influence the course of a person's life.

The study of gene change, also known as epigenetics, looks at the process of DNA methylation, where chemical molecules are added to DNA that "turn on" or "turn off" certain genes. The study showed that experiences play a role in shaping patterns of DNA methylation. Scientists have found that the socio-economic status of adults does not affect heredity. But childhood poverty interferes with the methylation process and is imprinted in the genes.

"We found biological traces of poor childhood living," said Michael Kobor, assistant professor of medical genetics at the University of British Columbia. "This is clear evidence that environmental influences indeed correlate with epigenetic patterns."

The amount of stress hormones produced by adults is also linked to changes in DNA. Kobor thinks it's a matter of which came first, the chicken or the egg. It is not known whether increased stress leaves traces in DNA in adults or, conversely, DNA determines how much stress hormones will be released. Kobor and colleagues also found that methylation can help predict future immune responses, meaning that first life experiences sometime in the future will influence adult responses to disease.

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