12.Why were Henrietta Lack´s cells so important?

 

 

Henrietta´s cells were the first inmortal human cells ever grown in culture.

Henrietta lived with her husband and five children.

She died in 1951, with only 31 years, because of an agresive cervical cáncer, and some of her cells were taken from her body. So many scientifics studied them, with nobody knowing about it, but her family discovered the studies in 1970, almost 19 years after.

Lot of samples were sended to different lavoratories all over the world. The cells were sended to space to investigate what would happen to them in zero gravity, were the first in be cloned.

Thanks to the cells scientifics discovered the virus HPV, which caused cervical cáncer, and created a vaccine to this virus.

Some scientifics prove that the cells can travell throught any surface and can evit their own destruction by reparing their DNA, but the reason they can do that is unknown for the moment.

What else could Hela cells make us dicover?

 

 

 

LINKS:

 

An animated video about Henrietta cells and Henrietta life:

https://www.youtube.com/watch?v=22lGbAVWhro

A page were you can find the answer to many other questions:

http://blog.ed.ted.com/

 

 

 

Why don't snowstorms produce thunders and lighting?

               

Becouse during the summer, the lower atmosphere is full of warm, humid air. Above that, it's cold and full of ice crystals. As the warm air rises, it carries water vapour with it, these molecules brush against the ice crystals, and this friction creates an electric field in the cloud -- like scuffing your feet across a carpet. The ice crystals gain a slight positive charge, and the updraft carries them to the top of the cloud, giving the cloud's bottom a net negative charge. Once the difference between the negatively charged cloud bottom and the positively charged ground becomes great enough, a bolt arcs between them.

But in snowy months, the atmosphere is cold and dry throughout, so there's no updraft to create friction within the clouds. Wind stirs the molecules and crystals some, but that action rarely generates a strong enough electric field to spark lightning.

The circunstances that need snow storms are:

-Is essential that the air is very cold.It has to be below

freezing for snow to fall.Also there has to be enough moisture in the air.the temperature must be cold both up in the clouds where snowflakes form, and down at ground level. If the air near ground level is too warm, the snow will melt on its way down, changing to rain or freezing rain.

       

    Eva Olarte Antón 1ºB ESO