Natural fission chain reactors on Earth Criticality in nature is uncommon.

His students included Karl Przibram, Paul Ehrenfest and Lise Meitner.

She died on 27 October 1968 at the age of 89.

They had two children Hans Ragnar (born 26 January 1963) and Ann Lise Lotte (25 February 1967 13 January 1998).

The cell wall is a very thin primary cell wall .

Do you have a cellphone?

Do you have a smartphone?

The phone rang.

My new phone is thinner than my old phone.

Proteins are also important in cell signaling, immune responses, cell adhesion, active transport across membranes, and the cell cycle.

It's the mobile phone.

My mobile phone was dead.

I want a cellular phone.

Do you have a cellphone?

I need to charge my mobile.

I need to charge my cell phone.

Charge your phone.

I love this mobile phone.

My cellphone has been stolen.

I don't have a cellphone anymore.

Where's your phone?

I don't have a cellphone.

My cellphone is ringing.

Tom doesn't have a cell phone.

Ah, I forgot my mobile phone.

I didn't have a phone.

Tom lost his phone.

I want this telephone.

I want this phone.

Turn off your cellphone.

Where's the cellphone?

Meitner relates that those who were close to Boltzmann were aware of his bouts of severe depression and his suicide attempts.

And so I thought, Maybe if it can promote cell growth, it can inhibit cell death, too.

In the 20th century, contributions by Lise Meitner, Erwin Schrödinger and Wolfgang Pauli to nuclear research and quantum mechanics were key to these areas' development during the 1920s and 1930s.

you're looking at a cellphone powered completely wirelessly.

I'm sick to death of this old cell phone.

Oh, that's a cell phone.

That's not a cell phone.

Also, my phone is running out of charge.

He's always losing his mobile.

This cellphone is really expensive.

This cell phone is really expensive.

My cell phone was off.

My phone is vibrating.

Tom's cellphone rang.