The narrator is terrible. Einstein's theory is difficult enough but when told by someone whose native language is clearly not English renders understanding almost impossible.

I would give the narrator less than one star if possible. She doesn't have an ugly voice but she mumbles and speaks too softly. Her voice is perfect for a bedtime story not a scientific book.

Sound quality rubbish

Narration is very poor. And the mistake of thinking that a 1 was the letter I shows she has no concept about the subject she's reading. On the other hand this is made by some open source audio company audiovox, which puts the recordings in the public domain and solicits volunteer readers. Hopefully Audiobooks.com isn't chargins us for an public domain recording, that would be cheesy. So I gave it a compromise 3 star.

I'm curious where the other comments are coming from. The narration and sound quality is fine and perfectly understandable.

good book very interesting

So interesting

The first narrator was somewhat lisping; the second one’s voice and pronunciation is so totally unsuitable for the content, more so for a romantic or erotic book. The quality of the sound is also bad.

I love the book. One of the narrators, I believe her last name is Lu, has an amazing voice, but it doesn't sound good when she reads a science book. Her voice is too soft and sounds like she was trying to hard on sounding that way. I hated all her whispering. Narrators Peter and M.L Collin were perfect for this book I give them a ????????????????????

The narrator mumbles through her dialogue. Clarity is needed for these types of readings and she sounds like she has something in her mouth.