Riddle 52 (Hard): A Science Case

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Answer 51#: The windows were closed!

Riddle 52): A chemist was murdered in his own lab. The only evidence was a piece of paper that had the names of chemical substances written on it. The substances were nickel, carbon, oxygen, lanthanum, and sulfur. The chemist only had three people come by his lab on the day of the murder: fellow scientist Claire, his nephew Nicolas, his wife, and his friend Marc. The police arrested the murderer right away. How did they know who it was?

I'm sorry you guys for not updating :( I just felt like the book wasn't making a difference and It really takes time for me to find the riddles so I didn't want my efforts to go in vain! But then with time, I found like 30 people checking my riddle and decided that it was worth it even for just 30 people <33

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