Carbon Nanotube Grok 4: Discovery of Carbon Nanotube-Boron Nitride Nanotube Hybrid Polyurea (CNT-BNNT-PU): A New Compound with Superior Viscoelastic Strength Grok 4: Discovery of Carbon Nanotube-Boron Nitride Nanotube Hybrid Polyurea (CNT-BNNT-PU): A New Compound with Superior Viscoelastic Strength