▁one ▁of ▁the ▁most ▁intr igu ing ▁writers ▁from ▁the ▁beginning ▁of ▁the ▁ 2 1 st ▁century . ▁Charles ▁Sim ic ▁is ▁a ▁notable ▁contemporary ▁Ser bian - American ▁poet , ▁former ▁United ▁States ▁Po et ▁La ure ate ▁and ▁a ▁Pul itzer ▁Prize ▁winner . ▁ ▁Education ▁and ▁science ▁ ▁Many ▁Ser bs ▁have ▁contributed ▁to ▁the ▁field ▁of ▁science ▁and ▁technology . ▁Ser bian ▁American ▁scient ist , ▁invent or , ▁phys ic ist , ▁mechanical ▁engineer ▁and ▁elect rical ▁engineer ▁Nik ola ▁T es la ▁is ▁regarded ▁as ▁one ▁of ▁the ▁most ▁important ▁invent ors ▁in ▁history . ▁He ▁is ▁ren owned ▁for ▁his ▁contributions ▁to ▁the ▁discipline ▁of ▁electric ity ▁and ▁magnet ism ▁in ▁the ▁late ▁ 1 9 th ▁and ▁early ▁ 2 0 th ▁century . ▁ ▁Seven ▁Ser bian ▁American ▁engine ers ▁and ▁scient ists ▁known ▁as ▁Ser bo ▁ 7 ▁took ▁part ▁in ▁construction ▁of ▁the ▁Apol lo ▁spaces hip . ▁Phys ic ist ▁and ▁physical ▁chem ist ▁Mih aj lo ▁P up in ▁is ▁best ▁known ▁for ▁his ▁land mark ▁theory ▁of ▁modern ▁elect rical ▁filters ▁as ▁well ▁as ▁for ▁his ▁numerous ▁pat ents , ▁while ▁Mil ut in ▁Mil ank ović ▁is ▁best ▁known ▁for ▁his ▁theory ▁of ▁long - term ▁climate ▁change ▁caused ▁by ▁changes ▁in ▁the ▁position ▁of ▁the ▁Earth ▁in ▁comparison ▁to ▁the ▁Sun , ▁now ▁known ▁as ▁Mil ank ov itch ▁cycles . ▁Mih ail o ▁Pet ro vić ▁is ▁known ▁for ▁having ▁contributed ▁significantly ▁to ▁differential ▁equations