Sunscreens, makeup, shampoo... the skin absorbs 60%! And women have 515 chemicals products on the skin each day! Moreover many cosmetics damage the corals and even the ocean in general.
What solutions can exist?

EQ company has developed natural products such as apricot kernel oil, they don't take bad substances for humans and the environment.
Official website: http://www.eq-love.fr/ 

We going to give you some tips about cosmetics :
     For protect your skin and the planet, take products with the logo "BIO". Use products with a latin name in the ingredients because it's natural.
     You shouldn't use cosmetics with this ingredients: petrolatom, paraffinum, -one word (dimethicone), -ane words, PEG, PPG, BHT, BHA, paraben.  

    If an ingredient starts with Ci ...., it's a unsafe ingredient but if an ingredient starts with Ci 77 ..., it's natural and with any dangers.

 

A exemple of naturals cosmetics : sunscreens by EQ (EVOA is the name of organic product line)

Eva Hirigoyen, Joëlle Balmès

Last week we met our friends from Greece, it was a cool experience because i've personally never met Grec and they are really smart too.
We ask them some questions about their school, christmas and a lot of other things.
It was interesting because their way of life is not the same as our, like they finished school at 2pm every day and they can eat whenever they want to.
They also told us how they celebrate christmas in Greece and it's the same in France exept that they decorate boats.

How to turn sea water into drinking wate

For the this project I worked in group with Cédric. The subject was proposed by Mr. Moulat our physics professor and he talked about the differents way to transform sea water into fresh water.
First we  filtered the seawater in order to separate sand from water. Then we distillated the water to get water with no mineral salts. At the end we measured the contentration of calcium ions (Ca²⁺) and magnesium ions (Mg²⁺) with mineral water (Contrexeville). The name of the experiment is colorimetric dosage

Distillation 

  
Colorimetric dosage

Taking a photo with a bottle

We are 2 partners working on this project: Léa Degos and me. 

We have chosen this subject because for me I would like to be a photagrapher and for Léa it's original and she likes this idea to take a photo in a different way!
Taking a photo with a bottle is in the principe of a pinhole.

The operation of this device is similar, on principle, to that of the eye.

When we look at an object, it reflects light rays enter the eye through a hole, the pupil, and reversed image forms on a screen, the retina.

We have made a pinhole camera with a bottle: - we cut the top of the bottle

  - we paint in black inside of the bottle

 - we put a light sensitive paper inside

 -we make a little hole in front of the paper

We try to take a photo of one tree in our hight school and we have to develop our images.This picture is in negative.

To develop a photo we need: -4 baths ( developper bath, stop bath, fixer bath and water bath)
                                               - A safelight lamp
                                               - a dark room

                            
In the futur, we have to transforming our negative picture in positif. We have to explaining to you how we do this!

A vidéo to show you how to develop a picture :

 

Coloring agents in sweets

 

Our project is about coloring agents in sweets. It consists of analysing the composition of coloring agents in sweets, the dangers and the diseases of coloring agents for human body.

We did experiments to discover what the coloring agent of the Smurf is. For this experiment we needed chemistry equipment (for example beaker, spectrophotometer, colorimeter...).

We made a Smurf solution to compare with other solutions of blue coloring agents in order to know what coloring agent is in the Smurf. When we find the good coloring agent ("blue Patenté V") we searched the concentration of coloring agent in one Smurf. For that, we made a scale of differents tints and we drew a curve of calibration to know the exact concentration.

https://www.youtube.com/watch?v=eI-ny8rkI24

Composition and Temperature of stars.

For this project, our team is Benoit and Jimmy, and our goal is to find the composition and temperature of stars. Our question is: The diferent compositions and temperatures between the sun and Vega. We found an experiment to discover the temperature of the sun with the law of Wien and that was a success because the sun temperature's surface (photoshere), is 6000 K (Kelvin or Degrees is the same because the temperature is too hot to see a difference, Kelvin= 273+°C), and we found 6100 K. We found an other experiment for composition but for the moment it was a failure and not finished. The material necessary is a white light, arc condenser, a lens, a slit, salt in ethanol solution (to burn), a prism and screen.
 Here we have a video of the composition of stars. And with the last experiment, which recreates how we made the Newton telescope.

In the second part, we had a school outing with Mr Moulat to use a telescope and to find an other star and compare it with the composition and temperature of the sun. For this we used a Newton telescope.

 Now all we can do is wait.

Comet 67p/churyumov-gerasimenko

A comet is a big rock. Humanity has always been interested and sometimes afraid about comets. A comet is composed of rock, dirt and ice and we can find this amazing object on the coldest and darknest part of solar system. These incredible comets are composed of 70% of water and smell like... rotten eggs, alcohol, vinegar. There is no gravity around comets and that was the problem for Rosetta mission. Comet 67P/Churyumov-Gerasimenko is very important because maybe we will find origins of humanity. Rosetta was sent ten years ago and landed on the comet the 12th November 2014 !