The Quran is not a scientific book, but a book of verses, that is, signs. However, it still contains undeniable scientific signs.
Al-‘Alaq
كَلَّا لَئِن لَّمۡ يَنتَهِ لَنَسۡفَعَۢا بِٱلنَّاصِيَةِ (15)
No indeed; if he does not desist, We will surely drag him by the forelock
نَاصِيَةٖ كَٰذِبَةٍ خَاطِئَةٖ (16)
a lying, sinful forelock[*]. 
[*] It alludes to the frontal lobe of the brain, where reasoning is processed.
 
Note that in these verses, God explicitly refers to the forehead and the front part of the head. After much research on the brain, neurologists found that the front part of the brain is responsible for social behavior, especially lying. By studying this part of the brain, researchers have developed several devices to detect the truth from the mouths of criminals, such that with fMRI technology that focuses on the forehead, they can detect lies. Do you think that saying such a subtle point thirteen centuries ago is anything but a sign of the existence of the Creator?​​​​​​​