erek erek speakerDerek Alexander Muller (born 9 November 1982) is a science communicator and media personality, best known for his channel Veritasium, which has overerek-erek-speaker erek-erek-speaker ; erek-erek-speaker ; erek-erek-speaker ; Hubungi kami di Live Chat (24 Jam) LACAK PESANAN. LACAK PESANAN. Nomor pesanan: