A 5,000-year-old grave, a 23-metre lake mystery and a smart dog brain — can you ace this week's science quiz?

Eight fresh science stories — from archaeological sensations to AI. How closely did you follow the world of science this week?

1. Where was the 5,000-year-old megalithic dolmen unearthed in the recent excavation?
2. What did a recent ELTE study prove about dogs' brains?
3. At what depth were the mysterious underwater structures found in Turkey's Lake Van?
4. True or false: researchers have already precisely determined the age and purpose of the structures found in Lake Van.
5. According to Wired, what are mathematicians grappling with as AI advances?
6. What evidence proved that Teotihuacan had its own writing system?
7. What did the joint study by Hungary's Institute of Experimental Medicine and German researchers clarify?
8. What does the newly published Stephen Hawking biography reveal?