Is Flex Seal Toxic To Humans. Yes, Flex Seal can be toxic to humans especially to young children. The central nervous system may be compromised by overexposure to this product, so any time you feel you are having a reaction to or an illness due to this product, you should seek medical attention.
No, Gai is not Lee's father. Rock Lee is actually an orphan whose parents were never revealed thorought the Naruto series. The reason why they look alike is simply because Lee choose to mimic Gai's style (i.e. the green clothes, bowl cut hair, etc.)
The closest thing we see in the series to Rock Lee's parent is Maito Guy haha.
Alveolar trill, also known as a rolled R, is a consonant sound that's used in about 40 per cent of all the languages in today's world. You can hear rolled R in Spanish, Russian, Italian, Greek, Arabic, and over 2000 other languages spoken by people on every continent.