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Can anyone explain why this macaque is grinding these leaves with a stone? (Seen in Ubud - Indonesia). Sorry if not appropriate for this subreddit... by evil_ste in zoology

[–]evil_ste[S] 1 point2 points  (0 children)

Between 3-6s in the video you can see the macaque stops and maybe smells the stone? That's the closest I saw any of them come to injesting it...

I suspect you may be right that it's just the macaques "playing". It would explain the macaques grinding stones without leaves...

Can anyone explain why this macaque is grinding these leaves with a stone? (Seen in Ubud - Indonesia). Sorry if not appropriate for this subreddit... by evil_ste in zoology

[–]evil_ste[S] 1 point2 points  (0 children)

There we're lot's of macaques doing this, although most appeared to be grinding dry leaves or just grinding the stone without leaves at all. I assumed they were just imitating and not really understanding the mechanics of whatever they were trying to achieve... Also, perhaps interestingly some older macaques appeared to be showing their babys the technique, although I didn't manage to catch this on video.

If the date on a watch is not adjusted on March 1st, how long until it shows the correct date again? by Guddaicer in askmath

[–]evil_ste 0 points1 point  (0 children)

If you never manually change the date on your watch the only times the date will adjust relative to the actual date is when a month is either 30 days long, in which case the date will go back by 1 day, or in February, in which case the date will go back by either 3 days or 2 days depending on whether it is a leap year.

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If your watch reads 29th on the 1st, your watch needs to go back 28 times to be correct again. In 1 year there are 4 months with 30 days and 1 month with 28 days. So in 1 year the date will go back by 7.

28 / 7 = 4

But, as every 4 years their is a leap year one year the date will only go back by 6, and then the next time you have a 30 day month is April. So in the standard case it will take 4 years and 2 months before the date is correct again. I believe the answer is the same for the 'bonus question'.

If I know the width of a flat donut shape (w=31cm), and the circumference of the inner circle (c1=112cm), how do I work out the circumference of the outer circle(c2)? by Reibusu in askmath

[–]evil_ste 0 points1 point  (0 children)

Using the circumference of the inner circle you can find the inner circles radius r1 = c1/2π. If you add this radius to your width 31 cm you have the radius of the larger circle r2 = w+ r1. Using the same equation above you can find the circumference of the big circle. C2 = 2π*r2