Continue reading the main story. The Wallace Line swerves among the islands of Indonesia from just west of Bali to the seas south of the Philippines. Itâs named after the British naturalist Alfred Russel Wallace, who discovered in the mid-19th century that different species of flora and fauna grew on either side.he Wallace Line swerves among the islands of Indonesia from just west of Bali to the seas south of the Philippines.
The USPSTF recommends that women who are 50 to 74 years old and are at average risk for breast cancer get a mammogram every two years. Women who are 40 to 49 years old should talk to their doctor or other health care professional about when to start and how often to get a mammogram. Women should weigh the benefits and risks of screening tests when deciding whether to begin getting mammograms at age 40.
Changes to mammogram guidelines might or might not be necessary in the future, as researchers continue studying this topic. Mayo Clinic supports screening beginning at age 40 because screening mammograms can detect breast abnormalities early in women in their 40s. Findings from a large study in Sweden of women in their 40s who underwent screening mammograms showed a decrease in breast cancer deaths by 29 percent.