the following is copied from:
a lot of interesting stuff there!
20th Century technology developed rapidly. Communication technology, transportation technology, broad teaching and implementation of Scientific method, and increased research spending all contributed to the advancement of modern science and technology. Due to the scientific gains directly tied to military research and development, technologies including electronic computing might have developed as rapidly as they did in part due to war. Radio, radar, and early sound recording were key technologies which paved the way for the telephone, fax machine, and magnetic storage of data. Energy and engine technology improvements were also vast, including nuclear power, developed after the Manhattan project. Transport by rocketry: most work occurred in the U.S. (Goddard), Russia (Tsiolkovsky) and Germany (Oberth). Making use of computers and advanced research labs, modern scientists have Recombinant DNA.
The National Academy of Engineering, by expert vote, established the following ranking of the most important technological developments of the 20th century :
4. Water supply and Distribution
6. Radio and Television
7. Mechanised agriculture
10. Air Conditioning and Refrigeration
15. Household appliances
16. Health Technologies
17. Petroleum and Petrochemical Technologies
18. Laser and Fiber Optics
19. Nuclear technologies
20. Materials science
 21st century
Main article: 2000s in science and technology
Despite the fact we have just entered into the 21st century, technology is being developed even more rapidly, marked progress in almost all fields of science and technology has led to massive improvements to the technology we currently possess, the rate of development in computers being only one example at which the speed of progress continues forward, leading to the speculation of a technological singularity occurring within this century. After the physical barriers of the integrated circuit are reached, quantum computers might be introduced. This could pave the way to the simulation of biological brains and/or the storage thereof.
Current ongoing developments include research into nanotechnology, bioengineering, nuclear fusion (see ITER and DEMO), advanced materials (e.g., enhanced armor), alternative fuel technologies (e.g., fuel cells, plugin hybrid cars), the scramjet (along with railguns and high-energy beams for military uses), superconductivity, the memristor and a plethora of other fields.
In electronics, researchers are trying to improve the efficiencies of LEDs and solar cells.
The understanding of particle physics is also expected to expand through particle accelerator projects, such as the LHC - the largest science project in the world  and neutrino detectors such as the ANTARES. Theoretical physics currently investigates quantum gravity proposals such as M-theory, superstring theory, and loop quantum gravity.
Spacecraft designs are also being developed, i.a. under the Project Constellation (see Orion and Ares V). The James Webb Space Telescope will try to identify early galaxies as well as the exact location of the Solar System within our galaxy, using the infrared spectrum. The finished International Space Station will provide an intermediate platform for space missions and zero gravity experiments. Despite challenges and criticism, the NASA and ESA plan a manned mission to Mars in the 2030s