Radiologist here. 👋🏻
You are right it does not require contrast. The scan uses a special technique to reduce signal from tissue that isn’t moving so only things that are moving produce high signal and show up “bright.” Since blood is the only thing really moving in the brain - voila!
Since October 2023, the rover has been exploring a region of Mars rich with sulfates, a kind of salt that contains sulfur and forms as water evaporates. But where past detections have been of sulfur-based minerals — in other words, a mix of sulfur and other materials — the rock Curiosity recently cracked open is made of elemental, or pure, sulfur. It isn’t clear what relationship, if any, the elemental sulfur has to other sulfur-based minerals in the area.
A 5 ounce bird can not carry a one pound coconut.
Not to mention nothing familiar to provide scale. As I was watching I was like are we 100 km above the ground or 100 m?
What in the pseudoscience is this?
I have no evidence of this theory but I suspect that it is partly a result of careful manipulation.
Many buttons/menus in iOS utilize the blue color for text or backgrounds that also is used when you message another iOS device. The result is that it feels congruent and natural within the color scheme of the operating system - if you are messaging an Apple device.
The green color used for messages to non Apple devices is somewhat jarring in comparison and subtly (or subconsciously) gives you the impression that something is not right. Additionally the green that was chosen provides less contrast to the white text (relative to the darker blue & white). So reading the green bubbles is just a little more effort. These effects combine to a general sense of unpleasantness.
I believe all of this is deliberate on Apple’s part and isn’t as simple as someone “caring” about colors but rather the situation being engineered to make them care.
The lung motion is be a problem but it is still done in some situations and the radiologist just tries their best with any motion artifacts. Since the blood vessels are so big in the chest it kind of works out, but it turns out better with contrast.