Laptop
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Recent research published in the journal Archives of Environmental and Occupational Health concluded that the "Laptop is paradoxically an improper site for the use of a LTC [laptop computer], which consequently should be renamed to not induce customers towards an improper use." [emphasis added]

What lead these reseachers to reach such a seemingly drastic conclusion?

In the study referenced above and titled "Exposure to electromagnetic fields from laptop use of "laptop" computers," researchers found that electromagnetic fields (EMFs) produced by laptop computers likely induce currents within the adult body, and the bodies of developing fetuses exposed by proxy, to unsafe levels. They found that in the laptop computers analyzed EMF values were "considerably higher than the values recommended by 2 recent guidelines for computer monitors magnetic field emissions..."

Furthermore:
When close to the body, the laptop induces currents that are within 34.2% to 49.8% ICNIRP recommendations, but not negligible, to the adult's body and to the fetus (in pregnant women). On the contrary, the power supply induces strong intracorporal electric current densities in the fetus and in the adult subject, which are respectively 182-263% and 71-483% higher than ICNIRP 98 basic restriction recommended to prevent adverse health effects.
- Archives of Environmental and Occupational Health, 2012 Jan; 67(1): 31-6
The fact that laptop computers may have adverse health effects was confirmed late last year (Nov. 2011) in the journal Fertility and Sterility, which we reported on in this article. In summary, researchers discovered that laptops connected to the internet through Wi-Fi decrease human sperm motility and increase sperm DNA fragmentation. This was the first human clinical study of its kind to establish that laptop-associated radiation can cause substantial harm to male fertility.

Laptop computers are far more convenient than desktops and difficult to avoid, especially if your livelihood is in any way connected to computer work and the internet. An effort should be made to use them cautiously and to avoid putting them directly on your lap. When circumstances make such exposures unavoidable it is possible that natural substances like turmeric, and propolis, along with other radioprotective substances, can reduce the adverse effects associated with exposure to harmful electromagnetic fields.