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The Feynman Lectures on Physics, The Most…

Jenny Winder originally shared this post:

The Feynman Lectures on Physics, The Most Popular Physics Book Ever Written, Now Completely Online

Last fall, we let you know that Caltech and The Feynman Lectures Website joined forces to create an online edition of The Feynman Lectures on Physics. They started with Volume 1. And now they’ve followed up with Volume 2 and Volume 3, making the collection complete.

The Chemical Behind Catnip’s Effects on…

+dee Clewes

Aida Hazlan originally shared this post:

The Chemical Behind Catnip's Effects on Cats


– 4aα,7α,7aα-Nepetalactone is the specific isomer responsible for the catnip effect

☠ Firstly, nepetalactone will enter the cat’s nasal tissue, and there it will bind to certain receptors.

☠ These can then trigger particular sensory neurons to signal to other neurons, and eventually the brain; in particular, the ‘olfactory bulb’, a region at the front of the brain responsible for processing smells.

☠ This region then signals other regions of the brain, including the amygdala, responsible for emotional responses to stimuli, and the hypothalamus, responsible for behavioural responses to stimuli.

☠ This results in the observed response in cats – a response that is actually similar to their response to natural sex pheromones.

☠ The effect of catnip lasts for around ten minutes, and afterwards there will be a refractory period of around an hour where the cat will remain unaffected.

☠ Interestingly, not all cats are affected by catnip; the response is genetic, and autosomal dominant, which means if one parent passes on the gene, then the offspring will inherit the response. 

Article source:

Video by BBC Nature:

Read more :  Inheritance of the catnip response in domestic cats , J. Hered (1962) 53 (2): 54-56

#caturday #chemistry   #scienceeveryday  

Sky-watchers can catch the iconic Perseids…

National Geographic originally shared this post:

Sky-watchers can catch the iconic Perseids meteor shower peak and four more celestial events this week.

5 Sky Events This Week: Planets Pair and Perseids Play

Although the moon may challenge sky-watchers’ views of shooting stars, it will join the seventh planet from the sun while bright worlds appear to pair together in the heavens. Mars and Saturn. Afte…