Top 100 presentations

1. Continuous Verb Tenses
   34943
2. Support and transport in plants
   33514
3. Anyong Tubig Anyong Lupa sa Asya
   29099
4. Elements compounds and mixtures
   25756
5. Chromosome
   21510
6. Simple Verb Tenses
   20641
7. Balancing Chemical Equations. Balancing redox equations
   19863
8. Atomic Structure
   19772
9. Periodic Behavior
   19720
10. Newton’s laws of motion
    18598
11. Periodic Trends
    16636
12. Adverbs
    16554
13. Percent Composition, Empirical and Molecular Formulas
    15876
14. Animal Farm
    15579
15. Bonding, Molecular Shape & Structure
    14516
16. MakingFood
    13222
17. Circulation and Gas Exchange
    13106
18. Fungi
    12702
19. DNA - An overview
    12700
20. Atomic Structure and Periodic Trends
    12610
21. Volumetric
    12500
22. Feminism- Cure or Curse
    12412
23. Atomic Structure and Periodicity
    12268
24. Hormones and the Endocrine System
    11867
25. Derivation Applications of Bernoulli Principal
    11705
26. Animal Development
    11700
27. Osmoregulation and Excretion
    11188
28. Plasma Membrane-Gateway to the Cell
    10629
29. Plant Structure, Growth, and Development
    10460
30. Acid, bases and salts
    9996
31. Development
    9960
32. Mirrors and Lenses
    9891
33. Structure of the Atom
    9772
34. Balanced forces
    9763
35. Pronouns
    9657
36. Mass Spectrometry
    9654
37. Nouns
    9559
38. Ancient Civilizations
    9524
39. Forests
    9246
40. Support and transport in plants
    9187
41. Atomic Structure
    9159
42. Resource Acquisition and Transport in Vascular Plants
    9158
43. Cell Types and Cell Structure
    8904
44. Newton’s third law of motion
    8779
45. Animal Nutrition
    8466
46. Transplantation Immunology
    8437
47. Cellular respiration
    8363
48. Growing Plants
    8165
49. Electrical Circuits
    8119
50. Sensory and Motor Mechanisms
    8043
51. Prepositions
    7897
52. Lab Equipment
    7874
53. Plant Responses to Internal and External Signals
    7820
54. Viruses, Viroids, and Prions
    7727
55. Neurons, Synapses, and Signaling
    7658
56. Of Mice and Men
    7657
57. Basic Structure of a Cell
    7533
58. Covalent Bonding (Molecules)
    7480
59. Plant structure adaptations and responses
    7465
60. Real time PCR and it's functions in diagnosis
    7445
61. A Tour of the Cell
    7435
62. Ionic Bonding
    7360
63. Cellular Division
    7258
64. To Kill a Mockingbird
    6927
65. Mendelian Genetics
    6918
66. Blood Type Genetics
    6903
67. Satellite Orbits and Uses NIS
    6847
68. Molecules and Ions
    6828
69. Well logging The Bore Hole
    6762
70. The Immune System
    6601
71. Membrane Structure and Function
    6522
72. Sound
    6503
73. Animal Reproduction
    6492
74. Rocks
    6481
75. The Chemistry of Acids and Bases
    6475
76. Angiosperm Reproduction and Biotechnology
    6425
77. Balancing Chemical Equations
    6386
78. Plant Diversity
    6372
79. Cell Communication
    6282
80. Rate Laws
    6250
81. Mendel and the Gene Idea
    6244
82. Drama
    6223
83. Hybridization of Orbitals
    6207
84. Introduction to Oscillations and Simple Harmonic Motion
    6138
85. Empirical Formula
    6102
86. The Building Blocks of Matter Atoms
    6102
87. Electron Quantum Numbers
    6065
88. Translation. Protein from RNA
    6035
89. Neurons
    5933
90. An Introduction to Metabolism
    5907
91. The Mole
    5831
92. The Structure and Function of Large Biological Molecules
    5772
93. Cell Membrane + Tissues & Organs Definitions
    5770
94. Karyotypes
    5760
95. ADP, ATP and Cellular Respiration
    5742
96. Earthquakes
    5719
97. Endocrine System
    5712
98. Photosynthesis
    5580
99. Conjunction
    5537
100. Classical greek philosophy
     5526

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)