Which of these would be the hardest to do (based on known science)?

[Maximum7]

Hardest to do in the real world AND hardest to do in the Star Wars universe so two. They can also be the same one.

1.) SQUID like device- https://www.google.com/amp/s/www.engadget.com/amp/2009/07/31/movie-gadget-friday-strange-days/

2.) Mind scanner- Something that can scan an organic beings mind.
3.) Synthetic Nano-being- A sentient being composed of billions or trillions of nanites.
4.) Magnetic monopole drive- https://en.m.wikipedia.org/wiki/Magnetic_monopole

5.) Thought recognition- A computer that activates with a thought from its user.
6.) Metaceutical- Pharmaceuticals made from inorganic particles.
7.) Femtocomputing- Computing at the a femtoscale. https://en.m.wikipedia.org/wiki/Femtotechnology

8.) Baby universe- Creating a Baby universe in a lab.
9.) Water synthesizer- Creating water from scratch
10.) Earthquake prediction- Predicting when an earthquake will occur.
11.) Radiation resistant crops- Crops that can survive in radiation contaminated soil.
12.) Computronium- https://en.m.wikipedia.org/wiki/Computronium

13.) Quantum entangled network interface card- https://en.m.wikipedia.org/wiki/Network_interface_controller

14.) Grow a brain- Grow a sentient brain in a lab
15.) Human-Animal communicator- Something to allow a human or other sentient being to communicate with an animal.
16.) Smelling signals- Genetically modifying beings to smell radio waves
17.) Overclockwork neurons- Supercharged neurons allowing for higher intelligence.
18.) Maelstrom stabilization- Stopping a storm
19.) Brain capacity test- A replacement to a IQ test to measure full brain potential
20.) Intelligent R&D mining tool- An intelligent agent that can do research.
21.) Portable DNA sequencer- Handheld DNA sequencer
22.) Supercapaterry- Fusion of a battery and a supercapacitor https://en.m.wikipedia.org/wiki/Supercapacitor

23.) Memory milk- Milk that can help improve memory
24.) Super-intelligent slime- A slime with sentience
25.) Behavoir altering virus- Could be used for mind control

 

[BWV]

Who cares about science in the Star Wars universe? its all magic and fantasy. Its stupid trying to turn it into hard SF

 

[some bloke]

Pretty sure 5, 10, 11, 15 and 25 are already possible.

5: I've read an article about neutrally-linked prosthetics. Limited, obviously, but you can think a specific thing and have that mapped to a movement.

10: Earthquakes are usually preceded by signs, I gather. but still people build on fault lines. Moneymoneymoneymoney...

11: GM foods will doubtlessly be able to do this, but presently it's not necessary. Evolution has probably done this at Chernobyl, but not necessarily with crops. This would be as "simple" as growing as many crops as possible in irradiated soil, and germinating from those which survive. selective breeding.

15: Not the sentiment you're thinking, but we can communicate with apes, dogs and even rats & birds using picture boards, training and a lot of patience. A universal communicator with humans would be difficult enough, let alone animals!

25: Look for the "zombie fungus" in ants. some make them climb high and clamp onto plants, grow a fungus from their head and spread the spores. Others make snails grow their eye stalks to look like a maggot and wiggle around until a bird eats them. Rabies makes you hydrophobic (as in scared of water, not as in a duck). behaviours are still just chemicals in the brain, manipulation them is feasible, but too complicated for now (though if it was possible, would the sort of people who have developed it be making it public knowledge? I doubt it.)