You'll never guess who this is! The beloved scientist Dr Karl is unrecognisable ...

He's a beloved scientist, known for making complex issues engaging through his many television and radio appearances.  

The now 68-year-old looks entirely unrecognisable in a snap shared to his Facebook page on Thursday.

The brooding young man with a hipster beard, long hair and a leather jacket looks little like the white-haired professor fond of loud, bright shirts that he is today.

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Who's that hunk? He's a beloved scientist, known for making complex issues engaging through his many television and radio appearances

Who's that hunk? He's a beloved scientist, known for making complex issues engaging through his many television and radio appearances

The picture is of a very young Dr Karl Kruszelnicki, a scientist known for his fun appearances on the ABC network and Triple J, among other programs. 

In the photo, Karl shoots a smouldering look to camera, showing off his mane of dark hair, impressive beard and bushy eyebrows. 

Sitting beside him is a milkshake in an old-fashioned silver cup with a blue and white straw.  

Speaking to news.com.au, the TV personality says he was barely out of his teens in the image. 

Guess who! The picture is of a very young Dr Karl Kruszelnicki, a scientist known for his fun appearances on the ABC network and Triple J, among other programs

Guess who! The picture is of a very young Dr Karl Kruszelnicki, a scientist known for his fun appearances on the ABC network and Triple J, among other programs

Looks different! Karl has shared images of himself in younger days to Instagram before 

Looks different! Karl has shared images of himself in younger days to Instagram before 

 'The photo is from

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