Saturday, October 31, 2015

Challenge


Thank you, Microsoft. That was challenging!






Wednesday, October 28, 2015

It's Coming...



The following video explains Halloween. I had never realized that the children originally wore costumes in order not to be spotted by the malevolent spirits of the night. A grand Halloween week-end in perspective...





Tuesday, October 27, 2015

Cleaner

European countries are experimenting with a new source for household electricity: a fuel cell from gas, from which one can generate - in a decentralised fashion -  enough electricity for heating and hot water in a home. This technology is already widely used in Japan.

It's cleaner 'n  coal!

http://agir-pour-le-climat.lefigaro.fr/initiatives-locales/engie-innove-grace-aux-piles-a-combustible_a-176-4716.html#xtor=AD-4

Sunday, October 25, 2015

Wednesday, October 21, 2015

Syria

I've long been curious about those Toyota trucks all all over war zones, like Syria. Here's an interesting article on the matter. And where do they get them?! I've also read the US left quite a few behind in Iraq.

http://www.msn.com/en-gb/cars/news/these-toyota-trucks-are-strangely-popular-with-terrorists-%e2%80%94-heres-why/ar-AAfgzn7?li=AAaeUIW





source: The Guardian, UK

Tuesday, October 20, 2015

Crocodile (times)

Times for our crocodile will be the following:




Sunday, October 18, 2015

Crocodile

Le Monde yesterday published a problem from a UK exam that caused
some mystification. The crocodile wants to reach the zebra, and can use a
number of combinations of swimming across and walking. (It is slower to swim).
What are:

- his time crossing immediately
- his time crossing to the zebra
- his best time

I am showing Grapher takes on the formula.





The answer is 8. First one finds the derivative. Then, one sets it to zero and solves for the root.



Setting that equation to 0 gets 8. The trick lies in isolating the square root,
then squaring both sides to get rid of it...