The Oldest Active Navy Ship Is A Century Old Russian Submarine Tender. For what it lacks in beauty it sure makes up for it in character, Russia's 100 year old Kommuna is the world's oldest active naval vessel. Launched as a submarine tender back 1915, this pre-Bolshevik Revolution relic continues to serve as a salvage ship and midget sub tender as part of Russia's Black Sea Fleet.
3. Cinnamon. The third answer to how to cause a miscarriage is cinnamon. Cinnamon is a naturally occurring abortifacient (a substance that causes miscarriage). When taken in the correct dosage, it causes uterine stimulation.
Although there have been many studies on whether caffeine increases the risk of miscarriage, the results are unclear. Most experts state that consuming fewer than 200 mg of caffeine (one 12-ounce cup of coffee) a day during pregnancy is safe.