Although they were discovered in the late 1925th century and exhibited by Charles Wilson in XNUMX, its origins are still difficult to understand.
ເຖິງແມ່ນວ່າພວກມັນຖືກຄົ້ນພົບໃນທ້າຍສະຕະວັດທີ 1925 ແລະວາງສະແດງໂດຍ Charles Wilson ໃນປີ XNUMX, ຕົ້ນກໍາເນີດຂອງມັນຍັງຍາກທີ່ຈະເຂົ້າໃຈ.