Namuhla emlandweni wezobuchwepheshe (April 21, 4)

Kusukela ekuqaleni kwemboni yezobuchwepheshe, izikhathi eziningi eziyisisekelo zenzeka nsuku zonke kule ndawo, ezibhalwe phansi emlandweni ngendlela ephawulekayo. Ochungechungeni lwethu olusha, nsuku zonke sikhumbula izikhathi ezithakazelisayo noma ezibalulekile ezixhunywe ngokomlando nedethi enikeziwe.

Ukukhishwa kwe-THOR-CD (1988)

Ngomhla zingama-21 kuMbasa, 1988, i-Tandy Corporation yamemezela ukuthuthukiswa kwe-THOR-CD - i-compact disc esulelekayo nesebenzisekayo kabusha yokuqopha umculo, ividiyo noma idatha. Nokho, ukukhiqizwa ngobuningi bama-disc kwahlehliswa kaningi, futhi i-Tandy Corporation yagcina imise yonke iphrojekthi ebizwa nge-THOR-CD - esinye sezizathu kwaba, phakathi kwezinye izinto, izindleko zokukhiqiza eziphakeme kakhulu. Ngesikhathi u-Tandy eqhamuka nalolu hlobo lwe-CD, ama-compact disc ayesetshenziswa ezikhathini eziningi njengabathwali bomculo, hhayi ukurekhoda idatha.

I-Child Online Protection Act iqala ukusebenza (2000)

Ngo-April 21, 2000, phakathi kwezinye izinto, uMthetho Wokuvikela Ubumfihlo Bezingane Ku-inthanethi, owavunywa ngo-Okthoba 1998, waqala ukusebenza Umthetho ukhuluma ngokuqoqwa kolwazi lomuntu siqu oluvela ezinganeni ezineminyaka engaphansi kweyi-13, okungeke kwenzeke ngaphandle kwe imvume yommeleli wezomthetho. Lo mthetho uyisizathu sokuthi kungani amanethiwekhi omphakathi amaningi kanye nezinsizakalo zewebhu zifinyeleleka kusukela eminyakeni engu-13.

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Eminye imicimbi (hhayi kuphela) emkhakheni wezobuchwepheshe

• Usosayensi waseDenmark uHans Christian Ørsted kuqala ubonisa ukuba khona kwe-electromagnetism (1820)
• U-Lee de Forest umemezela ukusungulwa kobuchwepheshe be-phonofilm, lapho kokubili umsindo nefilimu ku-strip eyodwa ye-celluloid (1919)