THE RECORD
What changed
Röntgen reported X-rays in 1895; Marconi filed a wireless telegraph patent the next year.
EVIDENCE
What remains
Radiographs, tubes, radio apparatus, patents and maritime logs document use.
WHY IT MATTERS
Why it matters
They expanded diagnosis and communication while creating radiation risk and spectrum control.
OPEN QUESTION
Where interpretation begins
Many studied radio waves; Marconi was not sole inventor, and early X-ray use lacked safety knowledge.