<p>Nancy Segal - Professor of Psychology, Director of the Twin Studies Center at California State University and author of 9 books about twins @nlsegal.</p>

Nancy Segal - Professor of Psychology, Director of the Twin Studies Center at California State University and author of 9 books about twins @nlsegal.

Extra: Private speech in twins

Jonathan responds to your texts and tweets, is joined in studio for all the latest science stories for Newsround and speaks to one of our two guests featured on the show.

Listen and subscribe to Futureproof with Johnathan McCrea on Apple Podcasts and Spotify.

Download, listen and subscribe on the Newstalk App.   

You can also listen to Newstalk live on newstalk.com or on Alexa, by and asking: 'Alexa, play Newstalk'

Science

Jonathan responds to your texts and tweets, is joined in studio for all the latest science stories for Newsround and speaks to one of our two guests featured on the show. Listen and subscribe to Futureproof with Johnathan McCrea on Apple Podcasts and Spotify. Download, listen and subscribe on the Newstalk App. You can also listen to Newstalk live on newstalk.com or on Alexa, by and asking: 'Alexa, play Newstalk'

Jonathan responds to your texts and tweets, is joined in studio for all the latest science stories for Newsround and speaks to one of our two guests featured on the show.

Listen and subscribe to Futureproof with Johnathan McCrea&nbsp;on Apple Podcasts and Spotify.

Download, listen and subscribe on the Newstalk App.&nbsp;&nbsp; 

You can also listen to Newstalk live on newstalk.com or on Alexa, by and asking: 'Alexa, play Newstalk'

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Extra: Private speech in twins

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