<Tr> <Td> Ancient Suez Canal </Td> <Td> early 3rd century BC </Td> <Td> Opened by Greek engineers under Ptolemy II (283--246 BC), following earlier, probably only partly successful attempts . </Td> <Td> </Td> </Tr> <Tr> <Td> Lighthouse </Td> <Td> c. 3rd century BC </Td> <Td> According to Homeric legend, Palamidis of Nafplio invented the first lighthouse, although they are certainly attested with the Lighthouse of Alexandria (designed and constructed by Sostratus of Cnidus) and the Colossus of Rhodes . However, Themistocles had earlier established a lighthouse at the harbor of Piraeus connected to Athens in the 5th century BC, essentially a small stone column with a fire beacon . </Td> <Td> </Td> </Tr> <Tr> <Td> Water wheel </Td> <Td> 3rd century BC </Td> <Td> First described by Philo of Byzantium (c. 280--220 BC). </Td> <Td> </Td> </Tr> <Tr> <Td> Alarm clock </Td> <Td> 3rd century BC </Td> <Td> The Hellenistic engineer and inventor Ctesibius (fl. 285--222 BC) fitted his clepsydras with a dial and pointer for indicating the time, and added elaborate "alarm systems, which could be made to drop pebbles on a gong, or blow trumpets (by forcing bell - jars down into water and taking the compressed air through a beating reed) at pre-set times" (Vitruv 11.11). </Td> <Td> </Td> </Tr>

Who was the first known scientist to work with pulleys and catapults